Accuracy of clinical diagnosis of Alzheimer's disease.

M Ridler, and Dr J Taylor for identifying the index patients and controls and Mrs Nora Jones for arranging for the collection of samples in Oxford. We are especially grateful to the patients who agreed to be included in the study and the late Professor Sir Alec Turnbull and other obstetricians who approached patients on our behalf and agreed to our interviewing them. The study was supported by Action Research for the Crippled Child.