Authors A, B, and C submitted a paper about the behaviour of a group of doctors. All the authors came from one institution, where the doctors’ behaviour had been studied. Author A did the data collection under the supervision of author B, who was obviously responsible for the design of the study and acted as guarantor. Author C was an official at the institution. The journal accepted it after revision, edited it, and sent out proofs. All the correspondence had been with author B.