Correction to: BMC Fam Pract

https://doi.org/10.1186/s12875-017-0649-6

Following publication of the original article [1], the authors reported an error to one of the ‘study groups’ in the authorship section. The collaborators of the study groups were not listed properly during typesetting. The members of the study groups are included here. The publisher would like to apologize for this error.