Study in Journal of Respiratory Therapy shows superiority of D-R Burton Healthcare vPEP® and confirms expiratory flow bias as the critical mechanism of action for respiratory airway clearance devices Share on facebook Share on google Share on twitter Share on linkedin Farmville, NC, Jan 08, 2018 D•R Burton Healthcare Products LLC, makers of the… Continue reading DRBurton vPEP® superiority in respiratory airway clearance