1. Department of Anesthesiology, Eglin Air Force Base Hospital , Eglin AFB, FL 32542, USA
2. Department of Anesthesiology, Brooke Army Medical Center , San Antonio, TX 78234, USA
3. Patient Safety Program, Clinical Support Division, Defense Health Agency , San Antonio, TX 78205, USA
4. Department of Pharmacy, Brooke Army Medical Center , San Antonio, TX 78219, USA
5. Infectious Disease Service, Department of Medicine, Brooke Army Medical Center , San Antonio, TX 78234, USA