...
机译:Air Ambulances With Sky-High Charges
Johns Hopkins Carey Business Sch, Accounting, Baltimore, MD 21202 USA;
Johns Hopkins Sch Med, Emerency Med, Baltimore, MD USA;
Johns Hopkins Carey Business Sch, Econ, Baltimore, MD USAJohns Hopkins Bloomberg Sch Publ Hlth, Hlth Policy & Management, Baltimore, MD 21205 USA;