title: To the Editor.
authors.affiliation: Department of Epidemiology, Faculty of Health, Ilam University of Medical Sciences, Ilam, Iran Managerial Epidemiology Research Center, Department of Public Health, School of Nursing and Midwifery, Maragheh University of Medical Sciences, Maragheh, Iran, Department of Epidemiology and Biostatistics, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran.
authors.forename: Reza
authors.initials: R
authors.lastname: Pakzad
authors.forename: Saeid
authors.initials: S
authors.lastname: Safiri