“…The study of Ger et al 52 used both hospital-based and population-based control subjects and was considered as a population-based study in the analysis. Nine studies 5,6,33,44,45,47,51,53,54 were restricted to men, and four studies 35,43,49,50 were restricted to women. Twelve studies 32,34,36 -42,46,48,55 reported data separately for both men and women.…”