COA vs COC Share ideas, questions and answers Search for: Home Page › Discussion Forum › Regulatory › COA vs COC This topic has 1 reply, 2 voices, and was last updated 1 year ago by Anonymous. Viewing 2 posts - 1 through 2 (of 2 total) Back to topics You need to Log In to access this content. Not yet a member? Join GCSG to gain full access to our educational resources and our member directory of more than 600 clinical supply colleagues! register now see membership features Viewing 2 posts - 1 through 2 (of 2 total) You must be logged in to reply to this topic.