Dr. Mathis this is Doris. We worked together a few years ago. Yvonne taught me most of what I know. I just founf out a few minutes ago that Yvonne passed and am deeply saddened about it. I ask the Lord to bless you with peace and hope that you are well. I am so sorry I miss her funeral. I wish you well and remember both of you fondly. With love and best regards, Doris Reyes