Correction.  [electronic resource] 

 -  BMJ open  Feb 2016 
 - e010100corr1 p.  digital 
<br/><br/> Publication Type: Published Erratum 
<br/><br/><label>ISSN: </label>2044-6055 
<br/><br/><label>Standard No.: </label>10.1136/bmjopen-2015-010100corr1  doi