1. Department of Medical Psychology, School of Medical Sciences, Universidad Nacional de Asunción, San Lorenzo, Paraguay
2. Regional Institute of Health Research, Universidad Nacional de Caaguazú, Coronel Oviedo, Paraguay
3. School of Medical Sciences, Universidad Sudamericana, Pedro Juan Caballero, Paraguay
4. Department of Statistics, School of Medical Sciences, Santa Rosa Campus, Universidad Nacional de Asunción, Santa Rosa del Aguaray, Paraguay