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  1. List of Excluded Studies - Opioid Treatments for Chronic Pain - NCBI Bookshelf 
    https://www.ncbi.nlm.nih.gov/books/NBK556254
    ... J, et al. Pilot study of nasal morphine-chitosan for the relief of breakthrough pain in patients ...
  2. Excluded Studies - Management of Postpartum Hemorrhage - NCBI Bookshelf 
    https://www.ncbi.nlm.nih.gov/books/NBK294466
    ... GA, Rolf N, et al. Uterine packing with chitosan-covered gauze for control of postpartum hemorrhage. Am ...
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