1. Nelson Blank, Federal University of Santa Catarina, Health Sciences Centre, Department of Public Health, CEP 88 040-900, Florianópolis/SC, Brazil, Correspondence Address: Dr. Nelson Blank Karolinska Institute Department of International Health and Social Medicine Unit of Social Medicine S-172 83, Sundbyberg, Sweden.
2. Karolinska Institute, Department of International Health and Social Medicine, Unit of Social Medicine, S-172 83, Sundbyberg, Sweden.