1. Department of Surgery, Medical and Social Sciences, Faculty of Medicine and Health Sciences, University of Alcalá, Ctra. Madrid-Barcelona, Km. 33.600, 28871 Alcalá de Henares, Spain
2. Leicester School of Allied Health Sciences, De Montfort University, Leicester LE1 9BH, UK
3. Scientific Department of Public Health, Microbiology and Immunology, Ernest Bai Koroma University of Science and Technology, Makeni 00232, Sierra Leone