Correction to: Early-stage studies to larger-scale trials: investigators' perspectives on scaling-up childhood obesity interventions.

ID5</td></tr><tr><td>7b</td><td>"In the pilot study we had teachers delivering intervention and in the main trial we went to the core non-degree staff delivering the intervention. We were embedded in the local school boards and they saw it as very useful from both a health and an educational point of view and the larger scale trial was really just a larger scale longer version of the pilot study." ID13</td></tr><tr><td rowspan="3"> Challenges</td><td rowspan="3">Challenges encountered when scaling pilot studies</td><td>12a</td><td>"In the pilot we had a small amount of group of teachers who were very motivated and who want to bring about a change but in our larger trial we had multiple teachers, multiple schools. [Extracted from the article]