RT Journal Article SR Electronic T1 Spontaneous Pneumoperitoneum Without Peritonitis JF Cleveland Clinic Journal of Medicine JO Cleve Clin J Med FD Cleveland Clinic SP 149 OP 155 VO 32 IS 3 A1 Papp, John P. A1 Sullivan, B. H. YR 1965 UL http://www.ccjm.org/content/32/3/149.abstract AB