Marsal JR, Ferreira-Gonzalez I, Bertran S, Ribera A, Permanyer-Miralda G, Garcia-Dorado D, Gomez G. The use of a binary composite endpoint and sample size requirement: influence of endpoints overlap. Am J Epidemiol. 2017 May 1;185(9):832-41. doi: 10.1093/aje/kww105