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P D Karkos,
S C Leong,
A K Arya,
S M Papouliakos,
M T Apostolidou
and W J Issing
(2007).
‘Complementary ENT’: a systematic review of commonly used supplements. The Journal of Laryngology & Otology,
121
,
pp 779-782
doi:10.1017/S002221510600449X