Ethics approval and consent to participate
The approval of the Ethics Committee of Shiraz University of Medical Sciences, Shiraz, Iran (No: 98-01-06-21446) was concurrently obtained. All methods were performed in accordance with the Declaration of Helsinki. A written and oral explanation about the study was given to all eligible participants. All participants voluntarily signed a written informed consent form before enrollment. Also, all participants signed the right to withdraw from the study at any time.