Baseline selection on a collider: a ubiquitous mechanism occurring in both representative and selected cohort studies.

Richiardi L, Pearce N, Pagano E, Di Cuonzo D, Zugna D, Pizzi C.

J Epidemiol Community Health 2019; 73: 475-480. (IF 3.872)

https://www.ncbi.nlm.nih.gov/pubmed/30804046