{HEAD ~ This invention} is based in {TAIL ~ part} upon the discovery that rapid drying of polymer hydrogels can eliminate the problem of unacceptable levels of soluble oligomers caused by prolonged thermal treatment 
is based in
{ HEAD ~ This invention } is based in { TAIL ~ part } upon the discovery that rapid drying of polymer hydrogels can eliminate the problem of unacceptable levels of soluble oligomers caused by prolonged thermal treatment
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