1- Department of Dermatology, Faculty of Medicine, Mazandaran University of Medical Sciences, Sari, IR Iran 2- Infectious Disease Research Center with Focus on Nosocomial Infection, Bou-Ali Sina Hospital, Mazandaran University of Medical Sciences, Sari, IR Iran , javadneg@yahoo.com 3- Infectious Disease Research Center with Focus on Nosocomial Infection, Bou-Ali Sina Hospital, Mazandaran University of Medical Sciences, Sari, IR Iran 4- Faculty of Medicine, Mazandaran University of Medical sciences, Sari, Iran