Selection bias and patterns of confounding in cohort studies: the case of the NINFEA web-based birth cohort.
Authors:
Pizzi C, De Stavola BL, Pearce N, Lazzarato F, Ghiotti P, Merletti F, Richiardi L.
Source:
J Epidemiol Community Health 2012; 66: 976-81. (IF 3.392)