Erratum: Long-term outcomes of bronchial thermoplasty in subjects with severe asthma: A comparison of 3-year follow-up results from two prospective multicentre studies. Geoffrey Chupp, Michel Laviolette, Lauren Cohn, Charlene McEvoy, Sandeep Bansal, Adrian Shifren, Sumita Khatri, G. Mark Grubb, Edmund McMullen, Racho Strauven and Joel N. Kline. (Eur Respir J (2017) 50 (1700017) DOI: 10.1183/13993003.00017-2017)