Cholecystectomy - a potential selection bias in studies assessing the metabolic effects of bariatric surgeries - Machado, Natasha Mendonca; Cardinelli, Camila de Siqueira; Shen, Tong; Santo, Marco Aurelio; Torrinhas, Raquel Susana Matos de Miranda; Waitzberg, Dan Linetzky (Scientific reports, 2020)