1. Statistics Department, Universidade Federal de Pernambuco, Av. Prof. Moraes Rego, 1235—Cidade Universitária, Recife—Prince Edward Island, Brazil, 50670-901
2. STORM, London Metropolitan University, 166-220 Holloway Rd, London N7 8DB, United Kingdom
3. NHMRC Clinical Trials Centre, University of Sydney, Locked bag 77, Camperdown New South Wales 1450, Austrália