[1] Karolinska Inst, Inst Environm Med, Unit Intervent & Implementat Res Worker Hlth, Nobels Vag 13,Box 210, SE-17177 Stockholm, Sweden
[2] Univ Nacl Colombia, Fac Ciencias Econ, Bogota, Colombia
[3] Univ Jorge Tadeo Lozano, Fac Ciencias Econ & Adm, Bogota, Colombia