Correspondence:
Rezvan Hosseinzadeh, Student Research Committee, Babol University of Medical Sciences, Babol, Iran. Email: r.hosseinzadeh@mubabol.ac.ir
Soheil Ebrahimpour, Infectious Diseases, and Tropical Medicine Research Center, Health Research Institute, Babol University of Medical Sciences, Babol, Iran. Email: drsoheil1503@yahoo.com