RT Journal Article SR Electronic T1 The impact of frequent users of OOH services. JF British Journal of General Practice JO Br J Gen Pract FD British Journal of General Practice SP 494 OP 495 VO 51 IS 467 A1 P Aird A1 P Hansford A1 R O'brien A1 L Parfitt A1 H Swindall YR 2001 UL http://bjgp.org/content/51/467/494.2.abstract AB