1 Department of Dermatology (Matsuoka, Tanaka, Nomura), Faculty of Medicine, University of Tsukuba, Tsukuba, Japan; Department of Dermatology (Matsuoka), Tsuchiura Kyodo General Hospital, Tsuchiura, Japan; Department of Dermatology (Tanaka), Mito Saiseikai General Hospital, Mito, Japan.
2 Department of Dermatology (Matsuoka, Tanaka, Nomura), Faculty of Medicine, University of Tsukuba, Tsukuba, Japan; Department of Dermatology (Matsuoka), Tsuchiura Kyodo General Hospital, Tsuchiura, Japan; Department of Dermatology (Tanaka), Mito Saiseikai General Hospital, Mito, Japan rytanaka@md.tsukuba.ac.jp.