RETRACTED: Long-term oxygen administration reduces plasma adrenomedullin levels in patients with obstructive sleep apnea syndrome

This article has been retracted at the request of the Authors. Please see Elsevier Policy on Article Withdrawal (http://www.elsevier.com/locate/withdrawalpolicy).Reason: Due to overlapping publication with Hypertension Research, the authors have voluntarily requested that the article be retracted. The corresponding publication, in Hypertension Research (Yamamoto H, Teramoto S, Yamaguchi Y, Hanaoka Y, Ishii M, Hibi S, Ouchi Y. Effect of Nasal Continuous Positive Airway Pressure Treatment on Plasma Adrenomedullin Levels in Patients with OSAS: Roles of Nocturnal Hypoxia and Oxidant Stress. Hypertens. Res. 30 (2007) 1065–1076.), has also been retracted, according to a letter from the Editor-in-Chief, sent March 21, 2008.