Expression of concern for

• RETRACTED: Effect of early versus late or no tracheostomy on mortality of critically ill patients receiving mechanical ventilation: a systematic review and meta-analysis.

  Siempos II, Ntaidou TK, Filippidis FT, Choi AM. Siempos II, et al. Lancet Respir Med. 2014 Jun 26:S2213-2600(14)70125-0. doi: 10.1016/S2213-2600(14)70125-0. Online ahead of print. Lancet Respir Med. 2014. Retraction in: Lancet Respir Med. 2015 Feb;3(2):102. doi: 10.1016/S2213-2600(15)00005-3. Corrected and republished in: Lancet Respir Med. 2015 Feb;3(2):150-158. doi: 10.1016/S2213-2600(15)00007-7. PMID: 24981963 Retracted. Corrected and republished.