What is the Optimal Attribution Method for Explainable Ophthalmic Disease Classification? - Amitojdeep Singh; Sourya Sengupta; J. Jothi Balaji; Mohammed Abdul Rasheed; Ibrahim Faruq; Varadharajan Jayakumar; John S. Zelek; Vasudevan Lakshminarayanan (OMIA@MICCAI, 2020)