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WASHINGTON -- The Food and Drug Administration is withholding a list of Chinese heparin suppliers requested by congressional investigators looking into problems with tainted supplies of the blood thinner, saying confidentiality agreements prevent release of the companies' names.
Members of Congress also are concerned that Chinese heparin manufacturers and their raw-material suppliers didn't fully cooperate with an FDA inspection team in February, after the heparin crisis erupted internationally, and barred the FDA from complete access to some workshops, records and workers.