[1] Brooke Army Med Ctr, Dept Anesthesia, JBSA Ft Sam Houston, TX 78234 USA
[2] San Antonio Uniformed Serv Hlth Educ Consortium, Dept Otolaryngol Head & Neck Surg, JBSA Ft Sam Houston, TX USA
[3] Uniformed Serv Univ Hlth Sci, Dept Anesthesiol, Bethesda, MD 20814 USA
[4] Henry M Jackson Fdn Inc, Rockville, MD 20852 USA
[5] Def & Vet Ctr Integrat Pain Management, Bethesda, MD 20814 USA