[1] Med Univ Lodz, Dept Pediat Propaedeut & Metab Bone Dis, Sporna St 36-50, PL-91738 Lodz, Poland
[2] Med Univ Bialystok, Dept Pediat Rheumatol Immunol & Metab Bone Dis, Waszyngtona St 17, PL-152742 Bialystok, Poland
[3] Med Univ Lublin, Dept Paediat Propaedeut, Gebali St 6, PL-20091 Lublin, Poland
[4] Poznan Univ Med Sci, Dept Pediat Endocrinol & Rheumatol, Szpitalna St 27-33, PL-60572 Poznan, Poland
[5] Med Univ Silesia, Sch Hlth Sci Katowice, Dept Paediat, Batorego St 15, PL-41902 Bytom, Poland
[6] Med Univ Silesia, Sch Med, Dept Paediat, Div Dent Zabrze, 3 Go Maja St 13-15, PL-41800 Zabrze, Poland
[7] Childrens Mem Hlth Inst Warsaw, Dept Biochem & Expt Med, Aleja Dzieci Polskich 20, PL-04730 Warsaw, Poland
[8] Univ Opole, Dept Med Simulat, Oleska St 48, PL-45052 Opole, Poland