1. Department of Paediatric, School of Medicine, Sabzevar University of Medical Sciences, Sabzevar, Iran;
2. Department of Dermatology, School of Medicine, Sabzevar University of Medical Sciences, Sabzevar, Iran;
3. Student Research Committee, Sabzevar University of Medical Sciences, Sabzevar, Iran;
4. Department of Social Medicine, School of Medicine, Sabzevar University of Medical Sciences, Sabzevar, Iran