Text and Data Mining valid from 2018-09-14
Received: 16 May 2018
Accepted: 21 August 2018
First Online: 14 September 2018
Compliance with ethical standards
: Midori Yoshida, Eiichi Honda, Erika Ozawa, Maristela Sayuri Inoue-Arai, Hiroko Ohmori, Keiji Moriyama, Takashi Ono, Tohru Kurabayashi, Hozumi Yoshihara, and Kulthida Nunthayanon Parakonthun declare that they have no conflict of interest.
: All procedures followed were in accordance with the ethical standards of the responsible committee on human experimentation (institutional and national) and with the Helsinki Declaration of 1964 and later versions.
: Informed consent was obtained from all patients for being included in the study.
: The research was approved by the Institutional Ethical Review Board of the Tokyo Medical and Dental University (Number 1282).