[1] Erasmus MC Univ, Dept Publ Hlth, Med Ctr, Rotterdam, Netherlands
[2] Charite, Dept Dermatol Venerol & Allergol, Skin Canc Ctr Charite, D-13353 Berlin, Germany
[3] Katholieke Univ Leuven, Res Grp Mkt, Fac Business & Econ, Louvain, Belgium
[4] Aristotle Univ Thessaloniki, Dept Dermatol 2, Papageorgiou Hosp, GR-54006 Thessaloniki, Greece