[1] Polish Mothers Mem Hosp Res Inst, Dept Obstet Perinatol & Gynecol, Ul Rzgowska 281-289, PL-93338 Lodz, Poland
[2] PreMediCare New Med Med Ctr, Ul Druzbickiego 13, PL-61693 Poznan, Poland
[3] Polish Mothers Mem Hosp Res Inst, Sci Lab, Ctr Med Lab Diagnost & Screening, Ul Rzgowska 281-289, PL-93338 Lodz, Poland
[4] Adam Mickiewicz Univ, Fac Chem, Dept Trace Element Anal Spect Method, Ul Umultowska 89b, PL-61614 Poznan, Poland
[5] Poznan Univ Tech, Inst Math, Ul Piotrowo 3A, PL-60965 Poznan, Poland
[6] Hannover Med Sch, Dept Obstet & Gynecol, Carl Neuberg Str 1, D-30625 Hannover, Germany
[7] Univ British Columbia, Fac Land & Food Syst, Food Nutr & Hlth Program, Vancouver, BC V6T 1Z4, Canada
[8] British Columbia Childrens Hosp, Res Inst, Vancouver, BC V5Z 4H4, Canada
[9] Poznan Univ Life Sci, Inst Human Nutr & Dietet, Ul Wojska Polskiego 31, Poznan, Poland