title: RETRACTED: Nicorandil vs nifedipine for the treatment of preterm labour: a randomized clinical trial.
abstract: This article has been retracted: please see Elsevier Policy on Article Withdrawal (http://www.elsevier.com/locate/withdrawalpolicy).
  
  This article has been retracted at the request of the Editor-in-Chief.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 editors were alerted to the following concerning features of this trial:
  
  The submission date is impossible. Patients were recruited at 24 to 34 weeks (mean 31 w). 18% of participants delivered after 37 weeks. Average recruitment 26 per month. Recruitment ended September 2014 but the paper was received by journal on 23 October 2014.
  
  The second author, Sayyed T, is co-author of related retracted papers in BJOG.
  
  In view of these concerns we wrote to Dr Rezk who had no satisfactory explanation and declined to share the data. We have therefore decided to retract.
authors.affiliation: Department of Obstetrics and Gynaecology, Faculty of Medicine, Menoufia University, Menoufia, Egypt. Electronic address: m_rezk9207@yahoo.com.
authors.forename: M
authors.initials: M
authors.lastname: Rezk
authors.affiliation: Department of Obstetrics and Gynaecology, Faculty of Medicine, Menoufia University, Menoufia, Egypt.
authors.forename: T
authors.initials: T
authors.lastname: Sayyed
authors.affiliation: Department of Obstetrics and Gynaecology, Faculty of Medicine, Menoufia University, Menoufia, Egypt.
authors.forename: A
authors.initials: A
authors.lastname: Masood
authors.affiliation: Department of Obstetrics and Gynaecology, Faculty of Medicine, Menoufia University, Menoufia, Egypt.
authors.forename: R
authors.initials: R
authors.lastname: Dawood
mesh_terms: D000293:Adolescent; D000328:Adult; D004311:Double-Blind Method; D005260:Female; D005315:Fetal Diseases / Q000139:chemically induced; D006261:Headache / Q000139:chemically induced; D006801:Humans; D020108:Nicorandil / Q000627:therapeutic use*; D009543:Nifedipine / Q000627:therapeutic use*; D007752:Obstetric Labor, Premature / Q000188:drug therapy*; D011247:Pregnancy; D011249:Pregnancy Complications, Cardiovascular / Q000139:chemically induced; D013610:Tachycardia / Q000139:chemically induced; D015149:Tocolytic Agents / Q000627:therapeutic use*; D016896:Treatment Outcome; D055815:Young Adult
chemical_list: D015149:Tocolytic Agents; D020108:Nicorandil; D009543:Nifedipine
keywords: Nicorandil; Nifedipine; Oral tocolytics; Preterm labour