RETRACTED: Comparative effects of vitamin K and vitamin D supplementation on prevention of osteopenia in calcium-deficient young rats.
This article has been retracted: please see Elsevier Policy on Article Withdrawal (http://www.elsevier.com/locate/withdrawalpolicy).

This article has been retracted at the request of the Editor-in-Chief.

The Journal has been made aware of concerns regarding the integrity of the data, authorship and ethical approval for this study. Despite repeated attempts to contact the co-authors we have been unable to confirm the authorship of this paper.
Iwamoto
J
J
Department of Sports Medicine, Keio University School of Medicine, Tokyo, Japan. jiwamoto@sc.itc.keio.ac.jp
Yeh
J K
JK
Takeda
T
T
Ichimura
S
S
Sato
Y
Y
D000818:Animals; D015519:Bone Density / Q000187:drug effects; D001851:Bone Diseases, Metabolic / Q000517:prevention & control*; D001842:Bone and Bones / Q000033:anatomy & histology; D002112:Calcifediol / Q000097:blood; D002117:Calcitriol / Q000097:blood; D002118:Calcium / Q000097:blood / Q000172:deficiency*; D002136:Calcium, Dietary / Q000008:administration & dosage; D005260:Female; D007408:Intestinal Absorption; D010281:Parathyroid Hormone / Q000097:blood; D010758:Phosphorus / Q000097:blood; D051381:Rats; D017207:Rats, Sprague-Dawley; D014807:Vitamin D / Q000008:administration & dosage*; D014812:Vitamin K / Q000008:administration & dosage*
D002136:Calcium, Dietary; D010281:Parathyroid Hormone; D014812:Vitamin K; D014807:Vitamin D; D010758:Phosphorus; D002117:Calcitriol; D002112:Calcifediol; D002118:Calcium