==== Front Exp AnimExp. AnimEXPANIMExperimental Animals1341-13571881-7122Japanese Association for Laboratory Animal Science 3005861855.357r110.1538/expanim.55.357r1RetractionRetraction: Comparative effects of alendronate and alfacalcidol on cancellous and cortical bone mass and bone mechanical properties in ovariectomized rats IWAMOTO Jun 1SEKI Azusa 2TAKEDA Tsuyoshi 1SATO Yoshihiro 3YAMADA Harumoto 4YEH James K. 51) Department of Sports Medicine, Keio University School of Medicine 2) Hamri Co., Ltd. 3) Department of Neurology, Mitate Hospital 4) Department of Orthopaedic Surgery, Fujita Health University5) Metabolism Laboratory, Department of Medicine, Winthrop-University Hospital Address corresponding: J. Iwamoto, Department of Sports Medicine, Keio University School of Medicine, 35 Shinanomachi, Shinjuku-ku, Tokyo 160-8582, Japan.1 8 2018 2018 1 8 2018 67 3 r2 r2 ©2018 Japanese Association for Laboratory Animal Science2018This is an open-access article distributed under the terms of the Creative Commons Attribution Non-Commercial No Derivatives (by-nc-nd) License. (CC-BY-NC-ND 4.0: https://creativecommons.org/licenses/by-nc-nd/4.0/) ==== Body The following articles have been retracted by the Editorial Board of Experimental Animals, because some parts of their contents were published elsewhere.