1. University of Oxford; Department of Public Health; Rosemary Rue Building, Old Road Campus Headington Oxford Oxfordshire UK OX3 7LF
2. Marilia Medical School; Department of General Internal Medicine and Clinical Epidemiology Unit; Avenida Monte Carmelo 800 Fragata Marilia São Paulo Brazil 17519-030
3. Ottawa Hospital Research Institute, The Ottawa Hospital - General Campus; Centre for Practice-Changing Research; 501 Smyth Road, Box 711 Ottawa Ontario Canada K1H 8L6
4. Centre for Statistics in Medicine; Oxford UK
5. Municipal Health Department; Infection Control; Av Prof. Malaquias de Oliveira Freitas 154 Barra Velha Ilhabela SP Brazil CEP 11630-000