1. Laboratory Design of Studies and Scientific Writing, ABC Faculty of Medicine; ABC Foundation; Santo André São Paulo Brazil
2. Department of Environmental Health, Harvard School of Public Health; Boston MA USA
3. Coronary Center of the Messejana's Hospital Dr. Carlos Alberto Studart Gomes; Fortaleza Cear Brazil
4. Heart Center, Tampere University Hospital and School of Medicine; University of Tampere; Finland
5. Heart Rhythm Service, Kingston General Hospital; Queen's University, Kingston ON; Canada