Text and Data Mining valid from 2018-07-28
Received: 30 December 2017
Accepted: 24 July 2018
First Online: 28 July 2018
Compliance with ethical standards
: Hiroshi Miyamoto, Kumiko Tanaka, Fumika Nakamura, Takahiro Ikeda, Shinji Kitamura, Tetsuo Kimura, Koichi Okamoto, Masahiro Sogabe, Naoki Muguruma, Yoshimi Bando, and Tetsuji Takayama declare that they have no conflict of interest.
: All procedures followed have been performed in accordance with the ethical standards laid down in the 1964 Declaration of Helsinki and its later amendments
: Informed consent was obtained from all patients for being included in the study.