Diagnostic Role of Preoperative Pure Tone Audiometry in Locating Type of Ossicular Chain Dysfunction in Chronic Suppurative Otitis Media *Corresponding author: Bhavya B M, 151, SAPTHASHRI, Bodhanahosahally, Off ITPL Main road, Bengaluru-560067, Karnataka, India. Tel: +919902931138; Email: anupamamreddy@gmail.com