It looks like no one else has a doctor who introduced the VibraLung as an excellent alternative to the Smartvest, especially for small women. As the Mac specialist and the pulmonary therapist explained to me in the hospital, vests can leave soreness and have to be cleaned. The Vibralung produces the same results without those. Cystic fibrosis patients, whose lives depend on mucus clearance, found this device worked well for them.