http://www.healthcaredesignmagazine.com/article/sound-masking-healthcare-environments?page=3&com_silverpop_iMA_page_visit_%2F=1&com_silverpop_iMA_page_visit_%2Fsearch%2Fapachesolr_search%2FWHITE_NPOISE=1&com_silverpop_iMA_page_visit_%2Fsearch%2Fapachesolr_search%2FWHITE_NOISE=1&com_silverpop_iMA_page_visit_%2Farticle%2Fevidence-based-design-new-aia-guidelines-noise-and-privacy=1&com_silverpop_iMA_page_visit_%2Fnews-item%2Fcisca-releases-white-paper-acoustics-healthcare-environments=1&com_silverpop_iMA_page_visit_%2Fnews-item%2Fvirginia-commonwealth-university-health-system-project-team-recognized-ashe-pdc=1&com_silverpop_iMA_page_visit_%2Fwebinars-whitepapers=1&com_silverpop_iMA_page_visit_%2Farticle%2Fsound-masking-healthcare-environments=1
Hope this helps!