Impact of the Clinical Trials Act 2018 on clinical trial activity in Japan from 2018 to 2020: a retrospective database study using new and conventional Japanese registries by Hiroyuki Taruno, Mari S Oba, Osamu Takizawa, Kayoko Kikuchi, Kazuaki Matsui, Mayumi Shikano

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Parental intentions and requests to provide pain care for their infants in neonatal intensive care units by Aya Shimizu, Takeshi Arimitsu, Kana Harada, Mio Ozawa

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Association between use of heated tobacco products and long-term respiratory effects considering smoking history: internet-based cross-sectional study in Japan by Yuki Kimura, Minoru Sugita

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Fas Ligand DNA Enhances a Vaccination Effect by Coadministered DNA Encoding a Tumor Antigen through Augmenting Production of Antibody against the Tumor Antigen by Boya Zhong, Guangyu Ma, Ayako Sato, Osamu Shimozato, Hongdan Liu, Quanhai Li, Masato Shingyoji, Yuji Tada, Koichiro Tatsumi, Hideaki Shimada, Kenzo Hiroshima, Masatoshi Tagawa

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Safety and Efficacy of a 6‐Month Placement of a Fully Covered Self‐Expanding Metallic Stent for Refractory Benign Biliary Stricture: A Multicenter Prospective Study by Tomohisa Iwai, Mitsuhiro Kida, Kazuya Sugimori, Hiroaki Shigoka, Takaaki Matsumoto, Masashi Ijima, Haruo Miwa, Kosuke Okuwaki, Masafumi Watanabe, Kai Adachi, Akihiro Tamaki, Taro Hanaoka, Junro Ishizaki, Chika Kusano

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Neural activity responsiveness by maturation of inhibition underlying critical period plasticity by Ibuki Matsumoto, Sou Nobukawa, Sou Nobukawa, Sou Nobukawa, Sou Nobukawa, Takashi Kanamaru, Takashi Kanamaru, Yusuke Sakemi, Yusuke Sakemi, Nina Sviridova, Nina Sviridova, Tomoki Kurikawa, Nobuhiko Wagatsuma, Kazuyuki Aihara, Kazuyuki Aihara

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Efficacy and safety of edoxaban in patients with chronic thromboembolic pulmonary hypertension: protocol for a multicentre, randomised, warfarin-controlled, parallel group trial -... by Keiichi Fukuda, Satoshi Yasuda, Hiroyuki Tsutsui, Toyoaki Murohara, Kohtaro Abe, Koichiro Tatsumi, Junji Kishimoto, Yu Taniguchi, Yuichi Tamura, Koji Todaka, Shun Minatsuki, Kazuya Hosokawa, Yuko Kobayakawa, Takumi Inami, Nobutaka Ikeda

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Obesity and Gastrointestinal Diseases by Ai Fujimoto, Shu Hoteya, Toshiro Iizuka, Osamu Ogawa, Toshifumi Mitani, Yuichiro Kuroki, Akira Matsui, Masanori Nakamura, Daisuke Kikuchi, Satoshi Yamashita, Tsukasa Furuhata, Akihiro Yamada, Noriko Nishida, Koji Arase, Mitsuyo Hashimoto, Yoshinori Igarashi, Mitsuru Kaise

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Primary results from the Japanese Heart Failure and Sudden Cardiac Death Prevention Trial (HINODE) by Kazutaka Aonuma, Kenji Ando, Kengo Kusano, Toru Asai, Koichi Inoue, Yukihiro Inamura, Takanori Ikeda, Takeshi Mitsuhashi, Toyoaki Murohara, Nobuhiro Nishii, Akihiko Nogami, Wataru Shimizu, Caroline Beaudoint, Torri Simon, Torsten Kayser, Hussin Azlan, Ngarmukos Tachapong, Joseph Yat‐Sun Chan, Valentina Kutyifa, Yasushi Sakata, For the HINODE Investigators

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Real‐World Study of EGFR‐TKI Rechallenge With Another TKI After First‐Line Osimertinib Discontinuation in Patients With EGFR‐Mutated Non‐Small Cell Lung Cancer: A Subset Analysis o... by Kei Sonehara, Kazunari Tateishi, Kiyotaka Yoh, Kazuhiro Usui, Yukio Hosomi, Kazuma Kishi, Go Naka, Kageaki Watanabe, Shu Tamano, Kohei Uemura, Hideo Kunitoh

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Erectile Function and Sexual Activity Are Declining in the Younger Generation: Results from a National Survey in Japan by Akira Tsujimura, Shinichiro Fukuhara, Koji Chiba, Tsuyoshi Yoshizawa, Hikaru Tomoe, Masato Shirai, Kazunori Kimura, Eiji Kikuchi, Eri Maeda, Yoshikazu Sato, Atsushi Nagai, Koichi Nagao, Haruaki Sasaki

Wound irrigation and peritoneal lavage with antiseptic/antibiotic solution before wound closure during gastrointestinal surgery: a systematic review and meta-analysis by Motoi Uchino, Koji Tamura, Shinsuke Nomura, Seiichi Shinji, Keita Kouzu, Hiroji Shinkawa, Tomohiro Ishinuki, Toru Mizuguchi, Hiroki Ohge, Seiji Haji, Junzo Shimizu, Yasuhiko Mohri, Chizuru Yamashita, Yuichi Kitagawa, Katsunori Suzuki, Motomu Kobayash, Masahiro Kobayashi, Yuki Hanai, Hiroshi Nobuhara, Hiroki Imaoka, Masahiro Yoshida, Toshihiko Mayumi, Hiroki Ikeuchi, on behalf of SSI Prevention Guideline Committee in Japan Society for Surgical Infection

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International perspective on social cognition in schizophrenia: current stage and the next steps by Silvia Corbera, Matthew M. Kurtz, Amélie M. Achim, Giulia Agostoni, Isabelle Amado, Michal Assaf, Stefano Barlati, Margherita Bechi, Roberto Cavallaro, Satoru Ikezawa, Hiroki Okano, Ryo Okubo, Rafael Penadés, Takashi Uchino, Antonio Vita, Yuji Yamada, Morris D Bell

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Posterior and Anterior Spinal Fusion for the Management of Deformities in Patients with Parkinson's Disease by Masashi Sato, Takeshi Sainoh, Sumihisa Orita, Kazuyo Yamauchi, Yasuchika Aoki, Tetsuhiro Ishikawa, Masayuki Miyagi, Hiroto Kamoda, Miyako Suzuki, Gou Kubota, Yoshihiro Sakuma, Kazuhide Inage, Yasuhiro Oikawa, Junichi Nakamura, Masashi Takaso, Gen Inoue, Tomoaki Toyone, Kazuhisa Takahashi, Seiji Ohtori

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Dietary sodium-to-potassium ratio as a risk factor for stroke, cardiovascular disease and all-cause mortality in Japan: the NIPPON DATA80 cohort study by Hirofumi Ohnishi, Yoshitaka Murakami, Katsuyuki Miura, Koji Tamakoshi, Hirotsugu Ueshima, Akira Okayama, Tomonori Okamura, Takayoshi Ohkubo, Toshiyuki Ojima, Yoshihiro Miyamoto, Maryam Zaid, Aya Kadota, Akira Fujiyoshi, Yosikazu Nakamura, Naoyuki Takashima, Atsushi Hozawa, Shigeyuki Saitoh, Yutaka Kiyohara, Fumiyoshi Kasagi, Nagako Okuda, Takehito Hayakawa, Hiroshi Akasaka, Yusuke Arai, Katsushi Yoshita, Kiyomi Sakata, Nobuo Nishi, Toru Izumi, Yasuhiro Matsumura, Hideaki Nakagawa, Yoshikuni Kita, Naomi Miyamatsu, Yasuyuki Nakamura, Kazunori Kodama

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Brain network alterations in anorexia Nervosa: A Multi-Center structural connectivity study by Jun Kanzawa, Ryo Kurokawa, Tsunehiko Takamura, Nobuhiro Nohara, Kouhei Kamiya, Yoshiya Moriguchi, Yasuhiro Sato, Yumi Hamamoto, Tomotaka Shoji, Tomohiko Muratsubaki, Motoaki Sugiura, Shin Fukudo, Yoshiyuki Hirano, Yusuke Sudo, Rio Kamashita, Sayo Hamatani, Noriko Numata, Koji Matsumoto, Eiji Shimizu, Naoki Kodama, Shingo Kakeda, Masatoshi Takahashi, Satoru Ide, Kazumasa Okada, Shu Takakura, Motoharu Gondo, Kazufumi Yoshihara, Masanori Isobe, Keima Tose, Tomomi Noda, Ryo Mishima, Michiko Kawabata, Shun’ichi Noma, Toshiya Murai, Kazuhiro Yoshiuchi, Atsushi Sekiguchi, Osamu Abe

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Global Practice Patterns and Variations in the Medical and Surgical Management of Non- Obstructive Azoospermia: Results of a World-Wide Survey, Guidelines and Expert Recommendation... by Amarnath Rambhatla, Rupin Shah, Imad Ziouziou, Priyank Kothari, Gianmaria Salvio, Murat Gul, Taha Hamoda, Parviz Kavoussi, Widi Atmoko, Tuncay Toprak, Ponco Birowo, Edmund Ko, Mohamed Arafa, Ramy Abou Ghayda, Vilvapathy Senguttuvan Karthikeyan, Giorgio Ivan Russo, Germar-Michael Pinggera, Eric Chung, Ahmed M. Harraz, Marlon Martinez, Nguyen Ho Vinh Phuoc, Nicholas Tadros, Ramadan Saleh, Missy Savira, Giovanni M. Colpi, Wael Zohdy, Edoardo Pescatori, Hyun Jun Park, Shinichiro Fukuhara, Akira Tsujimura, Cesar Rojas-Cruz, Angelo Marino, Siu King Mak, Edouard Amar, Wael Ibrahim, Puneet Sindhwani, Naif Alhathal, Gian Maria Busetto, Manaf Al Hashimi, Ahmed El-Sakka, Asci Ramazan, Fotios Dimitriadis, Massimiliano Timpano, Davor Jezek, Baris Altay, Daniel Suslik Zylbersztejn, Michael YC Wong, Du Geon Moon, Christine Wyns, Safar Gamidov, Hamed Akhavizadegan, Alessandro Franceschelli, Kaan Aydos, Nguyen Quang, Shedeed Ashour, Adel Al Dayel, Mohammed S. Al-Marhoon, Sava Micic, Saleh Binsaleh, Alayman Hussein, Haitham Elbardisi, Taymour Mostafa, Jonathan Ramsay, Athanasios Zachariou, Islam Fathy Soliman Abdelrahman, Osvaldo Rajmil, Arif Kalkanli, Juan Manuel Corral Molina, Kadir Bocu, Gede Wirya Kusuma Duarsa, Gökhan Çeker, Ege Can Serefoglu, Fahmi Bahar, Nazim Gherabi, Shinnosuke Kuroda, Abderrazak Bouzouita, Ahmet Gudeloglu, Erman Ceyhan, Mohamed Saeed Mohamed Hasan, Muhammad Ujudud Musa, Ahmad Motawi, Chak-Lam Cho, Hisanori Taniguchi, Christopher Chee Kong Ho, Jesus Fernando Solorzano Vazquez, Shingai Mutambirwa, Nur Dokuzeylul Gungor, Marion Bendayan, Carlo Giulioni, Aykut Baser, Marco Falcone, Luca Boeri, Gideon Blecher, Alireza Kheradmand, Tamilselvi Sethupathy, Ricky Adriansjah, Nima Narimani, Charalampos Konstantinidis, Tuan Thanh Nguyen, Andrian Japari, Parisa Dolati, Keerti Singh, Cevahir Ozer, Selcuk Sarikaya, Nadia Sheibak, Ndagijimana Jean Bosco, Mehmet Serkan Özkent, Sang Thanh Le, Ioannis Sokolakis, Darren Katz, Ryan Smith, Manh Nguyen Truong, Tan V. Le, Zhongwei Huang, Muslim Dogan Deger, Umut Arslan, Gokhan Calik, Giorgio Franco, Ayman Rashed, Oguzhan Kahraman, Sotiris Andreadakis, Rosadi Putra, Giancarlo Balercia, Kareim Khalafalla, Rossella Cannarella, Anh Đặng Tuấn, Amr El Meliegy, Birute Zilaitiene, Marlene Lizbeth Zamora Ramirez, Filippo Giacone, Aldo E. Calogero, Konstantinos Makarounis, Sunil Jindal, Bac Nguyen Hoai, Ravi Banthia, Marcelo Rodriguez Peña, Dharani Moorthy, Aram Adamyan, Deniz Kulaksiz, Hussein Kandil, Nikolaos Sofikitis, Ciro Salzano, Andreas Jungwirth, Surendra Reddy Banka, Tiago Cesar Mierzwa, Tahsin Turunç, Divyanu Jain, Armen Avoyan, Pietro Salacone, Ateş Kadıoğlu, Chirag Gupta, Haocheng Lin, Iman Shamohammadi, Nasser Mogharabian, Trenton Barrett, Yavuz Onur Danacıoğlu, Andrea Crafa, Salima Daoud, Vineet Malhotra, Abdulmalik Almardawi, Osama Mohamed Selim, Mohamad Moussa, Saeid Haghdani, Mesut Berkan Duran, Yannic Kunz, Mirko Preto, Elena Eugeni, Thang Nguyen, Ahmed Rashad Elshahid, Seso Sulijaya Suyono, Dyandra Parikesit, Essam Nada, Eduardo Gutiérrez Orozco, Florence Boitrelle, Nguyen Thi Minh Trang, Mounir Jamali, Raju Nair, Mikhail Ruzaev, Franco Gadda, Charalampos Thomas, Raphael Henrique Ferreira, Umit Gul, Serena Maruccia, Ajay Kanbur, Ella Kinzikeeva, Saad Mohammed Abumelha, Raghavender Kosgi, Fatih Gokalp, Mohammad Ayodhia Soebadi, Gustavo Marquesine Paul, Hesamoddin Sajadi, Deepak Gupte, Rafael F. Ambar, Emrullah Sogutdelen, Karun Singla, Ari Basukarno, Shannon Hee Kyung Kim, Mohammad Ali Sadighi Gilani, Koichi Nagao, Sakti Ronggowardhana Brodjonegoro, Andri Rezano, Mohamed Elkhouly, Rossella Mazzilli, Hasan M. A. Farsi, Hung Nguyen Ba, Hamed Alali, Dimitrios Kafetzis, Tran Quang Tien Long, Sami Alsaid, Hoang Bao Ngoc Cuong, Knigavko Oleksandr, Akhmad Mustafa, Herik Acosta, Hrishikesh Pai, Bahadır Şahin, Eko Arianto, Colin Teo, Sanjay Prakash Jayaprakash, Rinaldo Indra Rachman, Mustafa Gurkan Yenice, Omar Sefrioui, Shivam Priyadarshi, Marko Tanic, Noor Kareem Alfatlaw, Fikri Rizaldi, Ranjit B. Vishwakarma, George Kanakis, Dinesh Thomas Cherian, Joe Lee, Raisa Galstyan, Hakan Keskin, Janan Wurzacher, Doddy Hami Seno, Bambang S Noegroho, Ria Margiana, Qaisar Javed, Fabrizio Castiglioni, Raman Tanwar, Ana Puigvert, Coşkun Kaya, Medianto Purnomo, Chadi Yazbeck, Azwar Amir, Edson Borges, Marina Bellavia, Isaac Ardianson Deswanto, Vinod KV, Giovanni Liguori, Dang Hoang Minh, Kashif Siddiqi, Fulvio Colombo, Armand Zini, Niket Patel, Selahittin Çayan, Ula Al-kawaz, Maged Ragab, Guadalupe Hernández Hebrard, Jean de la Rosette, Ozan Efesoy, Ivan Hoffmann, Thiago Afonso Teixeira, Barış Saylam, Daniela Delgadillo, Ashok Agarwal