Erratum to: Researching Complex Interventions in Health: The State of the Art. Issue 1 (December 2016) - Craig, Peter; Rahm-Hallberg, Ingalill; Britten, Nicky; Borglin, Gunilla; Meyer, Gabriele; Köpke, Sascha; Noyes, Jane; Chandler, Jackie; Levati, Sara; Sales, Anne; Thabane, Lehana; Giangregorio, Lora; et al.