" Case report: A case of pyoderma gangrenosum with intractable leg ulcers treated by allogeneic cultured dermal substitutes " Toyozawa, Seiko; Yamamoto, Yuki; Nishide, Takeshi; Kishioka, Akiko; Kanazawa, Nobuo; Matsumoto, Yasuhiro; Kuroyanagi, Yoshimitsu; Furukawa, Fukumi