RT Journal Article SR Electronic T1 Non-valvular atrial fibrillation (NVAF) JF British Journal of General Practice JO Br J Gen Pract FD British Journal of General Practice SP 660 OP 661 VO 47 IS 423 A1 E Roderick A1 J Cox YR 1997 UL http://bjgp.org/content/47/423/660.3.abstract AB