1. Research Support Unit, Insular Maternal and Child University Hospital Complex, Canary Health Service, 35016 Las Palmas de Gran Canaria, Spain
2. Nursing Department, Faculty of Healthcare Science, Universidad de Las Palmas de Gran Canaria (ULPGC), 35016 Las Palmas de Gran Canaria, Spain
3. Las Remudas Primary Health Care Centre, Canary Health Service, 35213 Las Palmas de Gran Canaria, Spain
4. Department of Obstetrics and Gynaecology, Insular Maternal and Child University Hospital Complex, Canary Health Service, 35016 Las Palmas de Gran Canaria, Spain
5. Department of Nursing, University of Huelva, 21007 Huelva, Spain
6. Department of Community Nursing, Preventive Medicine, Public Health and History of Science, Faculty of Health Sciences, University of Alicante (UA), 03690 Alicante, Spain