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Last reviewed dd mmm yyyy. Last edited dd mmm yyyy

Authoring team

(1) Williamson IG, Whelan TR (1996), BJGP, 46, 743-7.

(2) Best Evidence [CD ROM] 1997; Philadelphia: American College of Physicians - American Society of Internal Medicine.

(3) Ann Otal Rhinol Laryngol (1996), 105, 371-8.

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