Author Contributions
Yasuhiro Matsuda, MD: Acquisition of data, drafting the manuscript, and revising the manuscript
Masaharu Masuda, MD, PhD: Drafting and revising the manuscript
Mitsutoshi Asai, MD, PhD: Revising the manuscript
Osamu Iida, MD: Revising the manuscript
Takashi Kanda, MD: Revising the manuscript
Toshiaki Mano, MD, PhD: Revising the manuscript