1. Department of Advanced Periodontics; Herman Ostrow School of Dentistry; University of Southern California; Los Angeles CA USA
2. Department of Psychology; Princeton University; Princeton NJ USA
3. private practice; Beverly Hills CA USA
4. Department of Prosthodontics; College of Medicine; University of Ulsan; Seoul Asan Medical Center; Seoul Korea
5. Department of Oral and Maxillofacial Surgery; College of Medicine; University of Ulsan; Seoul Asan Medical Center; Seoul Korea