Letter: The diabetic retinopathy study.
D001291:Attitude of Health Personnel; D002986:Clinical Trials as Topic; D003930:Diabetic Retinopathy / Q000601:surgery; D004992:Ethics, Medical; D006801:Humans; D008028:Light Coagulation; D010361:Patients; D012029:Refraction, Ocular; D012107:Research Design; D013223:Statistics as Topic