title: Response to Dr. Sani's letter to the editor.
authors.affiliation: Department of Clinical Functional Physiology, Toho University Medical Center Omori Hospital, Tokyo, Japan. mharada@med.toho-u.ac.jp.
authors.forename: Masahiko
authors.initials: M
authors.lastname: Harada
authors.affiliation: Department of Clinical Functional Physiology, Toho University Medical Center Omori Hospital, Tokyo, Japan.
authors.forename: Satoshi
authors.initials: S
authors.lastname: Tabako