1. L. Mao, M. Scicchitano, A. Merlo, D. Schwab, D. Sidransky, Department of Otolaryngology-Head and Neck Surgery, Division of Head and Neck Cancer Research, Johns Hopkins University School of Medicine, 818 Ross Research, 720 Rutland Avenue, Baltimore, MD 21205-2196, USA.
2. M. P. Schoenberg, Department of Urology, Johns Hopkins Hospital, 600 North Wolfe Street, Baltimore, MD 21287, USA.
3. Y. S. Erozan, Department of Pathology, Johns Hopkins Hospital, 600 North Wolfe Street, Baltimore, MD 21287, USA.