Comment on

• Methods to increase response rates to postal questionnaires.

  Edwards P, Roberts I, Clarke M, DiGuiseppi C, Pratap S, Wentz R, Kwan I, Cooper R. Edwards P, et al. Cochrane Database Syst Rev. 2007 Apr 18;(2):MR000008. doi: 10.1002/14651858.MR000008.pub3. Cochrane Database Syst Rev. 2007. Update in: Cochrane Database Syst Rev. 2009 Jul 08;(3):MR000008. doi: 10.1002/14651858.MR000008.pub4. PMID: 17443629 Updated.