1. Directorate for Nursing Services, Naval Hospital Rota, 11520 Cádiz, Spain
2. Department of Family Medicine, Naval Hospital Rota, 11520 Cádiz, Spain
3. Department of Psychology, Eastern Kentucky University, Richmond, Kentucky, KY 40475, USA
4. Penn State College of Medicine, Department of Family and Community Medicine, Hershey, PA 17033, USA