1. Department of Nursing, Faculty of Nursing, Physiotherapy and Podiatry, Universidad de Sevilla, 41009 Seville, Spain
2. Midwifery Training Unit, Department of Materno-Fetal Medicine, Genetics and Reproduction, Hospital Universitario Virgen del Rocio, 41013 Seville, Spain
3. Institute of Biomedicine of Seville, Hospital Universitario Virgen del Rocío/Consejo Superior de Investigaciones Científicas/Universidad de Sevilla, 41013 Seville, Spain
4. Centro de Investigación Biomédica en Red de Epidemiología y Salud Pública (CIBERESP), 28029 Madrid, Spain
5. School of Computer Science & Statistics, O’Reilly Institute, Trinity College Dublin, College Green 2, D02 PN40 Dublin, Ireland