[1] Bern Univ Hosp, Inselspital, Dept Pediat Surg, Bern, Switzerland
[2] Bern Univ Hosp, Inselspital, Div Gynecol Endocrinol & Reprod Med, Dept Gynecol, Bern, Switzerland
[3] Bern Univ Hosp, Inselspital, Div Pediat Endocrinol Diabetol & Metab, Dept Pediat, Bern, Switzerland
[4] Univ Bern, Dept BioMed Res, Bern, Switzerland
[5] Norwegian Inst Publ Hlth, Folkshelseinst, Oslo, Norway
[6] Cantonal Hosp Nidwalden, Dept Internal Med, Stans, Switzerland
[7] Cantonal Hosp Lucerne, Div Gynecol Endocrinol & Reprod Med, Dept Gynecol, Luzern, Switzerland