1. Department of Nursing and Physiotherapy University of León León Spain
2. Division of Nursing University Hospital of León León Spain
3. Department of Sociology, Social Work and Public Health University of Huelva Huelva Spain
4. Espíritu Santo University Guayaquil Republic of Ecuador
5. Premature Unit University Hospital of León León Spain
6. Health and Podiatry Unit, Department of Heatlh Sciences, Faculty of Nursing and Podiatry University of A Coruña, Campus of Esteiro Ferrol Spain