Ethics approval and consent to participate
This study have been performed in accordance with the Declaration of Helsinki and all methods were carried out in accordance with relevant guidelines and regulations. The Ethics Committee of Shiraz University of Medical Sciences, Shiraz, Iran approved the study (code: IR.SUMS.REC.1397.704). The authorities of the hospitals also issued the necessary permits to conduct the research. All participants were required to complete the informed consent forms and were assured about the voluntary participation and the confidentiality of their information.