RT Journal Article SR Electronic T1 Serial Changes in Hamman's Sign Secondary to the Evolution of a Shallow Left-Sided Spontaneous Pneumothorax JF Respiratory Care FD American Association for Respiratory Care SP respcare.03562 DO 10.4187/respcare.03562 A1 Katsuhito Seki A1 Hiroyuki Watanabe A1 Ryo Morita A1 Kazuhiro Sato A1 Mariko Asano A1 Takako Iino A1 Kenji Iino A1 Hiroshi Ito YR 2014 UL http://rc.rcjournal.com/content/early/2014/12/09/respcare.03562.abstract AB