1. Naval Medical Center Portsmouth, Portsmouth, VA 23708, USA
2. Department of Preventive Medicine and Biostatistics, Uniformed Services University of the Health Sciences, Bethesda, MD 20814, USA
3. Johns Hopkins Bloomberg School of Public Health, Baltimore, MD 21205, USA
4. Department of Surgery, Uniformed Services University of the Health Sciences, Bethesda, MD 20814, USA
5. Department of otolaryngology/head and neck surgery, Johns Hopkins School of Medicine, Baltimore, MD 21205, USA