title: Erratum to: Physical activity of elderly patients with rheumatoid arthritis and healthy individuals: an actigraphy study.
abstract: [This corrects the article DOI: 10.1186/s13030-015-0046-0.].
authors.affiliation: Department of Rehabilitation, Gunma University, 3-39-15 Syowa, Maebashi, 371-8511 Gunma Japan ; Department of Stress Sciences and Psychosomatic Medicine, The University of Tokyo, 7-3-1 Hongo, Bukyo-ku, 113-8655 Tokyo Japan.
authors.forename: Toshihide
authors.initials: T
authors.lastname: Hashimoto
authors.affiliation: Department of Stress Sciences and Psychosomatic Medicine, The University of Tokyo, 7-3-1 Hongo, Bukyo-ku, 113-8655 Tokyo Japan.
authors.forename: Kazuhiro
authors.initials: K
authors.lastname: Yoshiuchi
authors.affiliation: Department of Stress Sciences and Psychosomatic Medicine, The University of Tokyo, 7-3-1 Hongo, Bukyo-ku, 113-8655 Tokyo Japan.
authors.forename: Shyuji
authors.initials: S
authors.lastname: Inada
authors.affiliation: Department of Rehabilitation, Gunma University, 3-39-15 Syowa, Maebashi, 371-8511 Gunma Japan.
authors.forename: Kenji
authors.initials: K
authors.lastname: Shirakura
authors.affiliation: Department of Rehabilitation, Gunma University, 3-39-15 Syowa, Maebashi, 371-8511 Gunma Japan.
authors.forename: Naoki
authors.initials: N
authors.lastname: Wada
authors.affiliation: Department of Orthopedics, Isesaki Fukushima Hospital, 556-2 Kashima, Isesaki, 372-0015 Gunma Japan.
authors.forename: Kimihiko
authors.initials: K
authors.lastname: Takeuchi
authors.affiliation: Department of Orthopedics, Isesaki Fukushima Hospital, 556-2 Kashima, Isesaki, 372-0015 Gunma Japan.
authors.forename: Masatoshi
authors.initials: M
authors.lastname: Matsushita