Azathioprine‐induced severe myelosuppression accompanied by massive hair loss and painful oral ulcer in an autoimmune hepatitis patient with NUDT15 minor variant: A case report oleh Yu Takeuchi, Hidenao Noritake, Moe Matsumoto, Masahiro Umemura, Maho Yamashita, Kensuke Kitsugi, Shingo Takatori, Kazuyoshi Ohta, Jun Ito, Shin Shimoyama, Akira Kaysuya, Chiaki Maruyama, Kensuke Fukuchi, Satoshi Dohtan, Hiroe Sakata, Kazuhito Kawata