[1] Safarik Univ, Fac Med, Kosice Inst Soc & Hlth, Inst Publ Hlth, SK-04011 Kosice, Slovakia
[2] Safarik Univ, Fac Med, Inst Publ Hlth, Dept Hlth Psychol, SK-04011 Kosice, Slovakia
[3] Univ Groningen, Univ Med Ctr Groningen, Dept Social Med, Groningen, Netherlands