Letters to the Editor

Johnson T . (transl). The Workes of that Famous Chirugion Ambrose Parey, London, 1665: 243

Hildanus GF Observatio V : Puerorum depressum cranium, quomodo elevandum. In: Opera 1682; 83–4

Archer V . A novel use for the vacuum extractor. Papua New Guinea Med J 1982; 25: 288

Sherwood T . Ultrasonography in patients with suspected acute appendicitis. Br J Radiol 1991; 64: 183

Rosenquist CJ . AJR 1988; 150: 1189–90

Skaane P Amland PF Nordshus T Solheim K . Ultrasonography in patients with suspected acute appendicitis: A prospective study. Br J Radiol 1990; 63: 8787–793

Jeffrey RB Laing FC Townsend RR . Radiology 1988; 167: 327–9

Abu-Yousef MM Bleicher JJ Maher JW Urdaneta LD Franken EA Metcalf AM . AJR 1987; 149: 53–8

Rasmussen O Hoffman J . Assessment of the reliability of the symptoms and signs of acute appendicitis. JR Coll. Surg Edinb 1991; 36: 372–7

Paracelsus. Das Zweite Buch der Grossen Wundarznei. Der ander tractat. Das X11 capitel. Quoted in Coulter HL. Divided legacy; a history of the schism in medical thought, vol 1. Washington DC: Wehawken Book Co, 1977: 480

Kassirer P . Teaching clinical medicine by iterative hypothesis testing: Let's preach what we practice. N Engl J Med 1983; 309: 921–3

Elstein AS Shulman LS Sprafka SA . Medical problem solving: An analysis of clinical reasoning. Cambridge, Mass: Harvard University Press, 1978

Sackett DL Haynes RB Guyatt GH Tugwell P . Clinical epidemiology. A basic science for clinical medicine; 2nd edn. Boston: Little, Brown & Co. 1991: 10

Hoffbrand BI . Away with the system review: A plea for parsimony. BMJ 1989; 298: 817–19

Schwartz WB . Decision analysis: A look at the chief complaints. N Engl J Med 1979; 300: 556–9

Atkinson RS Boulton TO . The history of anaesthesia (ICSS 134). London: Royal Society of Medicine Services, 1989

Rasmussen RA Khalil MAK . Atmospheric trace gases: Trends and distribution over the last decade. Science 1986; 232: 1623–4

Green CD . Strain sensitivity of rats to nitrous oxide. Anesth Analg 1968; 47: 508–14

Chanarin I . The effects of nitrous oxide on cobalamins, folates and on related events. CRC Crit Rev Toxicol 1982; 10: 179–213

Ermens AAM Schoester M Spijkers LJM Lindemans J Abels J . Toxicity of methotrexate in rats preexposed to nitrous oxide. Cancer Res 1989; 49: 6337–6341

Criske HW , et al. Abst. 301, 1990 Int. Symp. Viral Hepatitis & Liver disease, April 4–8 1990 Houston, Texas, USA

Criske HW , et al. Arbeitsmed Sozialmed Preventivmed 1990; 25: 421–2

Sharpe MC Archard LG Banatvala JE , et al. Chronic fatigue Syndrome: Guidelines for research. J R Soc Med 1991 84; 118–21

David A Wessely S Pelosi A . Post-viral fatigue: Time for a new approach. BMJ 1988: 296: 696–9

Wessely S Powell R . Fatigue syndromes: A comparison of chronic “postviral” fatigue with neuromuscular and affective disorders. J Neurol Neurosurg Psychiatry 1989; 42: 940–8