PT - JOURNAL ARTICLE ED - , TI - The principles and practice of medicine DP - 1969 Jan 01 TA - The Journal of the Royal College of General Practitioners PG - 51--51 VI - 17 IP - 78 4099 - http://bjgp.org/content/17/78/51.3.short 4100 - http://bjgp.org/content/17/78/51.3.full SO - J R Coll Gen Pract1969 Jan 01; 17