1. Section of Endocrine Surgery, Department of Surgery, UCLA David Geffen School of Medicine , Los Angeles, CA 90095 , United States
2. Department of Research and Evaluation, Kaiser Permanente Southern California , Pasadena, CA , United States
3. Department of Health Systems Science, Kaiser Permanente Bernard J. Tyson School of Medicine , Pasadena, CA , United States
4. Department of Medicine, UCLA David Geffen School of Medicine , Los Angeles, CA , United States
5. Department of Surgery, Kaiser Permanente Los Angeles Medical Center , Los Angeles, CA , United States