Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) Matsubayashi Yoshiko and Ide Shuhei and Kishino Ayako,Safer use of speech valves for preventing aspiration on saliva in institutions:,Japanese Journal of Severe Motor and Intellectual Disabilities,1343-1439,Japanese Society on Severe Motor and Intellectual Disabilities,2014,39,3,467-475,https://cir.nii.ac.jp/crid/1390005910387640576,https://doi.org/10.24635/jsmid.39.3_467