Assessing the impact of novel social media policies in the USA restricting youth exposure to food and beverage advertisements: a protocol for a difference-in-difference study by Marie A Bragg, Brian Elbel, Omni Cassidy, Courtney Abrams, Stephanie L Albert, Roxanne Dupuis, Zora Hall, Sol Rego, Lloyd Heng, Emil Hafeez

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Cohort profile: study design and baseline characteristics of an observational longitudinal weight loss cohort and biorepository of patients undergoing sleeve gastrectomy in the USA by Melanie Jay, Eran Segal, Brian Elbel, Jose O Aleman, Sally M Vanegas, Silvia Curado, Akash Gujral, Gabriela Valverde, Susan Parraga, Migdalia Reid, Ann Marie Schmidt, Sean P Heffron, Huilin Li, Courtney Abrams, Mary A Sevick, Collin Popp, Evelyn Armijos, Ericka N Merriwether, Valentina Ivezaj, Christine Ren-Fielding, Manish Parikh

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