NEW : State health investigators also found deficiencies in Rivers ' treatment , according to a source close to the death investigation . Clinic says it made changes requested by accreditation officials after Rivers ' death . Dr. Gwen Korovin ` ` categorically denied '' what a source told CNN . The source says that Korovin joked that Rivers would ' ve thought it was funny . Korovin is well known for helping patients with voice trouble .
NEW : Clinic says it made changes requested by accreditation officials after Rivers ' death . Dr. Gwen Korovin ` ` categorically denied '' what a source told CNN . The source says that Korovin joked that Rivers would ' ve thought it was funny . Korovin is well known for helping patients with voice trouble .