Please somebody comment on my English.
1- Different drugs have difference confounding factors to prescribers in order to prescribe them such as number of potential patients at certain time
2- No information given about the interviewers and training they had in order to familiarize them with the questionnaires.
3 - No information whether the doctors received and read the letters. On top of that, the computer systems that had been used could only identify the attending physician, which might or might not the prescribing physicians.