1Department of Pathology, Soonchunhyang University, Asan, Korea.
2Department of Pathology, Yonsei University, Seoul, Korea.
3Department of Pathology, Ewha Womans University, Seoul, Korea.
4Department of Pathology, Inha University, Incheon, Korea.
5Department of Pathology, Aju University, Suwon, Korea.
6Department of Pathology, Catholic University, Seoul, Korea.
7Department of Pathology, Ulsan University, Seoul, Korea.
8Department of Pathology, Chonbuk National University, Jeonju, Korea.
9Department of Pathology, Seoul National University, Seoul, Korea.
10Department of Pathology, Gachon University, Incheon, Korea.
11Department of Pathology, Inje University, Seoul, Korea.
12Department of Pathology, Pusan National University, Busan, Korea.
13Department of Pathology, Chungnam National University, Daejeon, Korea.
14Department of Pathology, Eulji University, Daejeon, Korea.
15Department of Pathology, Yeungnam University, Daegu, Korea.
16Department of Pathology, Korea University, Seoul, Korea.
17Department of Pathology, Hanyang University, Seoul, Korea. parkmh@hanyang.ac.kr