1 Department of Pathology, The Affiliated Hospital of Qingdao University, Jiangsu Road, South District, Qingdao, 266003, Shandong, China.
2 Department of Dermatology, The Affiliated Hospital of Qingdao University, Qingdao, 266003, China.
3 Department of Pathology, The Affiliated Hospital of Qingdao University, Jiangsu Road, South District, Qingdao, 266003, Shandong, China. fanghuan40477@163.com.