1. Human Reproduction Unit, Gynecology Service, University Hospital of the Canary Islands, 38320 Tenerife, Spain
2. Departamento de Obstetricia-Ginecología, Pediatría, Preventiva, Medicina Legal y Forense, Microbiología, Parasitología, Universidad de la Laguna, 38200 Santa Cruz de Tenerife, Spain
3. Nursing Department, University of Seville, 41004 Sevilla, Spain
4. Department of Social, Developmental and Educational Psychology, Universidad de Huelva, 21007 Huelva, Spain