Home Publications Validity issues relating to time-to-pregn[...] Validity issues relating to time-to-pregnancy studies of fertility Academic Article Publisert 2006 Jens Peter Bonde; Michael Joffe; Markku Sallmen; Petter Kristensen; Jørn Olsen; Nel Roeleveld; Allen Wilcox Epidemiology, 17(4): 347-349. Read publication