Text and Data Mining valid from 2019-06-04
Received: 25 December 2018
Accepted: 23 April 2019
First Online: 4 June 2019
Compliance with ethical standards
: Takeshi Uozumi, Seki Hideyuki, Emi Matsuzono, Susumu Sogabe, Nozomu Sugai, Jun Fujita, Junichi Suzuki, Mayuko Akimoto, Mitsuru Yanai, and Akira Suzuki 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.