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Norwegian Inst Publ Hlth, Spiren Fertil Clin, POB 222 Skoyen, N-0213 Oslo, Norway
Norwegian Inst Publ Hlth, Ctr Fertil & Hlth, POB 222 Skoyen, N-0213 Oslo, Norway Univ Copenhagen, Dept Obstet & Gynaecol, Hvidovre Hosp, Kettegaard Alle 30, DK-2650 Hvidovre, Denmark