Coffee, including caffeinated and decaffeinated coffee, and the risk of hepatocellular carcinoma: a systematic review and dose–response meta-analysis by Paul Roderick, Peter Clive Hayes, Julie Parkes, Ryan Buchanan, Oliver John Kennedy, Jonathan Andrew Fallowfield

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Outcome in patients undergoing postponed elective surgery during the COVID-19 pandemic (TRACE II): study protocol for a multicentre prospective observational study by Markus W Hollmann, Gert Jan Scheffer, Wolfgang Buhre, Sander van Kuijk, Seppe Koopman, Dianne de Korte-de Boer, Peter G Noordzij, Alice C Werger, Jennifer Breel, Carolien S E Bulte, Bas A in ‘t Veld, Carin G C L Wensing

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Relationships between multiple patient safety outcomes and healthcare and hospital-related risk factors in colorectal resection cases: cross-sectional evidence from a nationwide sa... by Ralf Kuhlen, Jochen Schmitt, Felix Walther, Martin Roessler, Peter Scriba, Maria Eberlein-Gonska, Olaf Schoffer

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Effectiveness of ‘Tackle Your Tics’, a brief, intensive group-based exposure therapy programme for children with tic disorders: study protocol of a randomised controlled trial by Danielle Cath, Annet Heijerman-Holtgrefe, Chaim Huyser, Cara Verdellen, Jolande van de Griendt, Laura Beljaars, Kees-Jan Kan, Ramón Lindauer, Pieter Hoekstra, Lisbeth Utens

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Impact of regionalisation and case-volume on neonatal and perinatal mortality: an umbrella review by Jochen Schmitt, Stefanie Deckert, Mario Rüdiger, Felix Walther, Denise Bianca Küster, Anja Bieber, Jürgen Malzahn

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Impact of education and training on LGBT-specific health issues for healthcare students and professionals: a systematic review of comparative studies by Kate Jolly, Ameeta Retzer, Sarah Damery, Nicola Kay Gale, Adekemi Oluwayemisi Sekoni, Ifeoma Okafor, Bibiane Manga-Atangana, Rachel Posaner

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How effective is undergraduate palliative care teaching for medical students? A systematic literature review by Jason W Boland, Jane Gibbins, Megan E L Brown, Gabrielle M Finn, Angelique Duenas

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Associations between environmental exposures and asthma control and exacerbations in young children: a systematic review by Steve Turner, Jon G Ayres, Hilary Cowie, Smita Dick, Emma Doust

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Comparison of I-gel and Baska mask in elective surgery: a meta-analysis by Hao Wang, Jiaxin Shen, Jiaxiao Shi, Xiaoyun Miao, Jinglin Zhao, Qingchun Dai

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Sustainable employability in Supported Employment and IPS interventions in the context of the characteristics of work and perspectives of the employers: a scoping review protocol by Pirjo Juvonen-Posti, Matti Joensuu, Joonas Poutanen, Kirsi Unkila

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Does improving sleep lead to better mental health? A protocol for a meta-analytic review of randomised controlled trials by Georgina Rowse, Alexander J Scott, Thomas L Webb

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Multicentre, 26-week, open-label phase 2 trial of the JAK inhibitor filgotinib in Behçet’s disease, idiopathic inflammatory myopathies and IgG4-related disease: DRIMID study protoc... by Sander W Tas, Joost Raaphorst, Paco M J Welsing, Jacob M van Laar, Rogier M Thurlings, Robbert J Goekoop, César Magro Checa, Jan A M van Laar, Bettina C Geertsema-Hoeve, Nicolle H Rekers, Erik Present

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Exploring the association between khat use and psychiatric symptoms: a systematic review by Betsy Edwards, Naomi Atkins

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Chronic obstructive pulmonary disease and the risk of stroke: a systematic review protocol by Jennifer K Quint, Ann D Morgan, Chetna Sharma, Kieran J Rothnie

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Application of probiotics, prebiotics and synbiotics in patients with breast cancer: a systematic review and meta-analysis protocol for randomised controlled trials by Wenjie Liu, Wenyao Cui, Xinrong Chen, Dan Duan, Maojun Chen

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Acupuncture for psoriasis: protocol for a systematic review by Lei Wang, Weiming Wang, Haoyu Yang, Nuo Li, Yanping Bai

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Effectiveness of mHealth/eHealth interventions on obesity treatment: a protocol for umbrella review of meta-analyses by Xi Yang, Xiang-Guo Lei, Zhongheng Huang, Tamrakar Rashi

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Protocol for a systematic review of economic evaluations considering costs and health outcomes of weather and climate-related extreme events in humans by Collins Iwuji, Saeideh Babashahi, Kingsley Orievulu, Ekeminiabasi Eyita-Okon, Dominic Kniveton

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Medical versus surgical methods of early abortion: protocol for a systematic review and environmental scan of patient decision aids by Rachel Thompson, Kyla Z Donnelly

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Respiratory rehabilitation techniques for patients with cystic fibrosis: a protocol for a systematic review and network meta-analysis by Xuefeng Chen, Xinyu Wang, Na Lin, Yilong Tang

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