All of the following are the predisposing factors for squamous carcinoma of esophagus except

Surgery

All of the following are the predisposing factors for squamous carcinoma of esophagus except

A tender swelling in submandibular triangle is mostly likely diagnosed as

In transfacial proportions, the face Is divided into how many segments:

Specific for Ankylosing spondylitis is true?