Acknowledgements
This research has been financially supported by Tehran University of
Medical Sciences & health services grant [grant number:
99-1-101-47279]. The supporting institution had no involvement in
study design; in the collection, analysis and interpretation of data; in
the writing of the report; and in the decision to submit the article for
publication. Authors also would like to appreciate the support and
constructive comments of the methodologist(s) research development
office, Imam khomeini Hospital complex. We would like to thank our
patients for their time and cooperation, and also the medical staff of
the Imam Khomeini Hospital Complex who helped facilitated the process of
our research.
Conflict of Interest: none