1. Department of Clinical Medicine, Miguel Hernández University, San Juan de Alicante, Alicante, Spain
2. Department of Pathology and Surgery, Miguel Hernández University, San Juan de Alicante, Alicante, Spain
3. Department of Education, San Antonio Catholic University, Murcia, Spain
4. Centre for Information and AIDS Prevention, Conselleria de Sanitat, Alicante, Spain
5. Department of Nursing, University of Salamanca, Salamanca, Spain