[1] Med Univ Silesia, Sch Med Katowice, Dept Epidemiol, Medykow 18 Str, PL-40752 Katowice, Poland
[2] Univ Saskatchewan, Coll Med, Canadian Ctr Hlth & Safety Agr, 104 Clin Pl,POB 23, Saskatoon, SK S7N 2Z4, Canada
[3] Univ Saskatchewan, Coll Med, Dept Med, 103 Hosp Dr, Saskatoon, SK S7N 0W8, Canada
[4] Yanka Kupala State Univ Grodno, Dept Sports Med & Rehabil, 22 Ozheshko Str, Grodno 230023, BELARUS
[5] Med Univ Lodz, Norbert Barlicki Mem Teaching Hosp 1, Dept Gen & Oncol Pulmonol, Kopcinskiego 22 Str, PL-90153 Lodz, Poland
[6] Warsaw Med Univ, Dept Family Med, Banacha St 1a, PL-02097 Warsaw, Poland
[7] Krasnoyarsk State Pedag Univ, Dept Social Pedag & Social Work, A Lebedeva 89 Str, Krasnoyarsk 660017, Russia
[8] Lithuanian Univ Hlth Sci, Inst Biol Syst & Genet Res, MLK, Eiveniu 4 Str, LT-50103 Kaunas, Lithuania
[9] Univ Rzeszow, Fac Med, Dept Human Physiol & Pathophysiol, Kopisto 2a Str, PL-35359 Rzeszow, Poland
[10] Clin Prov Hosp 2, Dept Allergol & Cyst Fibrosis, Lwowska 60 Str, PL-35301 Rzeszow, Poland
[11] Slovak Med Univ Bratislava, Fac Publ Hlth, Dept Epidemiol, Limbova 14 Str, Bratislava 83303, Slovakia
[12] Med Univ Bialystok, Dept Lung Dis & TB 2, Zurawia 14 Str, PL-15540 Bialystok, Poland
[13] Grodno State Med Univ, Dept Gen Hyg & Ecol, Gorkogo 80 Str, Grodno 230009, BELARUS
[14] Krasnoyarsk State Pedag Univ, Dept Childhood Psychol, Lebedeva 89 Str, Krasnoyarsk 660017, Russia
[15] Med Univ Silesia, Sch Med Katowice, Dept Pneumonol, Ziolowa 45-47, PL-40635 Katowice, Poland