[1] Univ Siena, Dept Mol & Dev Med, I-53100 Siena, Italy
[2] Italian Natl Inst Hlth, Natl Ctr Dis Prevent & Hlth Promot, I-00161 Rome, Italy
[3] Inst Mother & Child Hlth, Dept Child & Adolescent Hlth, PL-01211 Warsaw, Poland
[4] Univ Galway, Hlth Promot Res Ctr, Galway H91TK33, Ireland
[5] Univ New England, Einar B Thorsteinsson Sch Psychol, Armidale, NSW 2351, Australia
[6] Univ Med, Fac Med, Tirana, Albania
[7] Univ Luxembourg, Dept Social Sci, L-4365 Esch Sur Alzette, Luxembourg
[8] Univ Jyvaskyla, Fac Sport & Hlth Sci, Res Ctr Hlth Promot, FI-40014 Jyvaskyla, Finland
[9] Univ Libre Bruxelles, Res Ctr Epidemiol Biostat & Clin Res, Sch Publ Hlth, CP598, Brussels, Belgium