Long-term clinical efficacy of grass-pollen immunotherapy.
Durham SR; Walker SM; Varga EM; Jacobson MR; O'Brien F; Noble W; Till SJ; Hamid QA; Nouri-Aria KT; The New England Journal Of Medicine, 1999, vol. 341, issue 7, p 468, ISSN 00284793. ISBN 00284793.
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