Correction to: BMC Med Res Methodol

https://doi.org/10.1186/s12874-019-0857-y

In the original publication of this article [1], the author should be only the collaboration group “STARSurg Collaborative”. In the “STARSurg Collaborative”, the author S. Mookerjee’s name should be shown as the full name Souradip Mookerjee.