-1 polypropylene Polymers 0.000 description 4.238000004519 manufacturing process Methods 0.000 description 4.NOQGZXFMHARMLW-UHFFFAOYSA-N Succinic acid 2,2-dimethylhydrazide Chemical compound CN(C)NC(=O)CCC(O)=O NOQGZXFMHARMLW-UHFFFAOYSA-N 0.000 description 7.238000005859 coupling reaction Methods 0.000 description 8.239000003795 chemical substances by application Substances 0.000 claims 1.239000003351 stiffener Substances 0.000 claims description 4.230000004308 accommodation Effects 0.000 claims description 4.230000029058 respiratory gaseous exchange Effects 0.000 claims description 15.208000000927 Sleep Apnea Syndrome Diseases 0.000 claims abstract description 5.
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