Kinesh Changela, and Madhavi Reddy. “Smoker’s Melanosis: Isolated Pigmented Lesion in the Laryngopharynx and Esophagus”. Turkish Journal of Gastroenterology, vol. 28, no. 6, July 2019, pp. 524-5, https://tjg.avesjournals.com/index.php/tjg/article/view/3464.