Root and canal configurations of maxillary first premolars in 22 countries using two classification systems: a multinational cross-sectional study by Fatma Pertek Hatipoğlu, Güldane Magat, Mohmed Isaqali Karobari, Ahmad A. Madarati, Indira Tulegenova, Ömer Hatipoğlu, Nessrin Taha, Nisrein Makahleh, Rafael Fernández-Grisales, Olga Bekjanova, Mehdi Rahimi, David Donnermeyer, Ahmed A. Madfa, Xenos Petridis, Martha Gallegos Intriago, Tanvi Shah, Safaa Allawi, Anja Ivica, Wen Yi Lim, Abdelrahman Hamouda, Rohan Jagtap, Benjamín Martín-Biedma, Anna Paulina Lehmann, Suha Alfirjani, Paulo J. Palma, Glynn Dale Buchanan

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