Background publications
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Wang, Liu, Liu, Zeng, Wu, Yang, Shen, Li: "Correlation of pepsin-measured laryngopharyngeal reflux disease with symptoms and signs." in: Otolaryngology--head and neck surgery : official journal of American Academy of Otolaryngology-Head and Neck Surgery, Vol. 143, Issue 6, pp. 765-71, 2010 (PubMed).
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