RT Journal Article SR Electronic T1 Selection of the primary end point in an observational cohort study JF Journal of Epidemiology and Community Health JO J Epidemiol Community Health FD BMJ Publishing Group Ltd SP 950 OP 953 DO 10.1136/jech-2015-206656 VO 70 IS 10 A1 Gómez, Guadalupe A1 Plana-Ripoll, Oleguer A1 Dafni, Urania YR 2016 UL http://jech.bmj.com/content/70/10/950.abstract AB