Lisa Sheehy	David Felson	YuQing Zhang	Jingbo Niu	Yuk-Miu Lam	Neil Segal	John Lynch	T.D.V. Cooke
Conception and design	√	√						√
Analysis and interpretation of the data	√	√	√	√	√			√
Drafting of the article	√	√						√
Critical revision of the article for important intellectual content	√	√	√	√	√	√	√	√
Provision of study materials or patients		√				√	√
Statistical expertise	√	√	√	√	√
Obtaining of funding	√	√
Administrative, technical, or logistic support	√	√
Collection and assembly of data	√					√	√
Final approval of the article	√	√	√	√	√	√	√	√