TY - JOUR T1 - The principles and practice of clinical trials JF - The Journal of the Royal College of General Practitioners JO - J R Coll Gen Pract SP - 166 LP - 167 VL - 21 IS - 104 A2 - , Y1 - 1971/03/01 UR - http://bjgp.org/content/21/104/166.2.abstract N2 - 300 Multiple ChoicesThis is a pdf-only article and there is no markup to show you.full-text.pdf ER -