Text and Data Mining valid from 2019-11-08
Received: 5 September 2019
Accepted: 24 October 2019
First Online: 8 November 2019
Compliance with ethical standards
: Keiichi Tominaga, Mimari Kanazawa, Kazuhiro Takenaka, Takanao Tanaka, Takeshi Sugaya, Koh Fukushi, YukaTakagi, Kazunori Nagashima, Keiichiro Abe, Naoya Izawa, Kohei Tsuchida, Makoto Iijima, Kenichi Goda, Hidetsugu Yamagishi, and Atsushi Irisawa declear 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.