Alyouzbaki, Abdullah Zuhair, Amer Khatib, Mustafa Shennak, Awni Abu Sneineh, and Muawyah Al Bdour. 2016. “Tongue Hyperpigmentation During Interferon and Ribavirin Therapy; A Case Report”. Jordan Medical Journal 50 (4). https://archives.ju.edu.jo/index.php/jmj/article/view/11871.