3298504 PSPW post-reflux swallow-induced peristaltic wave 57 3298509 PSPW potato starch processing wastewater 4 3298505 PSPW post-reflux swallow-induced peristaltic wave index 2 3298508 PSPW wine-processed PSP 2 3298507 PSPW percentage significant predictor weight 1 3298506 PSPW planar staggered plasmonic waveguide 1