[1] Palacky Univ Olomouc, Fac Med & Dent, Dept Publ Hlth, Olomouc, Czech Republic
[2] Charles Univ Prague, Fac Med Hradec Kralove, Inst Prevent Med, Hradec Kralove, Czech Republic
[3] Palacky Univ Olomouc, Fac Med & Dent, Dept Publ Hlth, Hnevotinska 976-3, Olomouc 77515, Czech Republic