Department of General Thoracic Surgery (Ichimura, Kikuchi)
Department of Respiratory Medicine; Tsukuba Medical Center Hospital; Amakubo, Tsukuba-shi; Ibaraki, Japan (Ishikawa)
Disclosure: The authors declare no conflicts of interest.
Address for correspondence: Hideo Ichimura, MD, Department of General Thoracic Surgery, Tsukuba Medical Center Hospital, 1-3-1 Amakubo, Tsukuba-shi, Ibaraki 305-8558, Japan. E-mail: firstname.lastname@example.org