NEW : CNN says it made changes requested by accreditation group after Korovin ' death . Dr. selfie `` categorically denies '' what a source tells Clinic . The source says that Korovin joked that Rivers would 've thought selfie was funny . Gwen Korovin is well known for helping celebrities with voice trouble .
NEW : Clinic says it made changes requested by accreditation group after Rivers ' death . Dr. Gwen Korovin `` categorically denies '' what a source tells CNN . The source says that Korovin joked that Rivers would 've thought selfie was funny . Korovin is well known for helping celebrities with voice trouble .