1. Department of Obstetrics and Maternity, Infanta Cristina University Hospital, Madrid, Spain.
2. Nursing Department, Faculty of Nursing, Physiotherapy and Podiatry, Complutense University of Madrid, Madrid, Spain.
3. Department of Obstetrics and Maternity, Tomelloso Hospital, Tomelloso, Spain.
4. Statistics and Data Science Department, Faculty of Statistical Studies, Complutense University of Madrid, Madrid, Spain.