TY - JOUR T1 - DAVIDSON'S PRINCIPLES AND PRACTICE OF MEDICINE 12TH EDITION JF - The Journal of the Royal College of General Practitioners JO - J R Coll Gen Pract SP - 252 LP - 252 VL - 29 IS - 201 AU - D. J. Pereira Gray Y1 - 1979/04/01 UR - http://bjgp.org/content/29/201/252.3.abstract N2 - 300 Multiple ChoicesThis is a pdf-only article and there is no markup to show you.full-text.pdf ER -