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