Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Flowchart of patient selection and stratification. CHANCE = Carolina Head and Neck Cancer Study; HNSCC = head and neck squamous cell carcinoma; HP = hypopharynx; HPV = human papillomavirus; NOS = not otherwise specified; OC = oral cavity; OP = otopharyngeal; OPSCC = oropharyngeal squamous cell carcinoma.
