1. 1Department of Pathology, Oklahoma University Health Sciences Center, Oklahoma City, Oklahoma, USA
2. 2Department of Pathology, Cho Ray Hospital, Ho Chi Minh, Vietnam
3. 3Department of Pathology, University of Medicine and Pharmacy, Ho Chi Minh, Vietnam
4. 4Department of Pathology and Thyroid Disease Center, Izumi City General Hospital, Izumi-city, Wake-cho, Japan