1. CAPES Foundation, Ministry of Brazil, Brasilia, Brazil
2. School of Nursing, University of Sao Paulo, Sao Paulo, Brazil
3. Faculty of Medicine, University of Sao Paulo, Sao Paulo, Brazil
4. Department of Statistical and Actuarial Sciences, University of Western Ontario, London, Canada
5. Department of Nursing, University of Sergipe, Aracaju, Sergipe, Brazil