Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) Kousaku Matsubara and Hiroyuki Nigami and Hidekazu Harigaya,Pneumomediastinum in newborns induced by the Elder CPR/demand valve during resuscitation,Acta Paediatrica Japonica,03745600,Carlton South,1997-02,39,1,88-91,https://cir.nii.ac.jp/crid/1520853834725728768,