Factors affecting the preparedness of Helicopter Emergency Medical Services (HEMS) in disasters: a systematic review.

"Declarations Competing interestsThe authors declare no competing interests. Ethics approval and consent to participateThe present study was conducted in terms of the principles of the revised Declaration of Helsinki, which is a statement of ethical principles that directs physicians and other participants in medical research involving human subjects. The participants were assured about their anonymity and confidentiality of their information. Moreover, the proposal of this study was approved by the Ethics Committee affiliated with Shiraz University of Medical Sciences (SUMS), Shiraz, Iran with the code of (IR.SUMS.NUMIMG.REC.1402.009). Consent to publishNot applicable. Competing interests The authors declare no competing interests."

"Funding This research did not receive any specific grant from funding agencies in the public, commercial, or not for profit sectors."