Word counts:
Text: 704
number of references:8
Total number of figures:2
Total number of tables: 0
Conflict of interest: The authors have no conflicts of interest to declare.
Acknowledgment: The authors would like to thank the Clinical Research Development Unit (CRDU) of Loghman Hakim Hospital, Shahid Beheshti University of Medical Sciences, Tehran, Iran for their support, cooperation and assistance throughout the period of study