RT Journal Article SR Electronic T1 Superior Pulmonary Sulcus Tumor or Pancoast Syndrome JF Cleveland Clinic Journal of Medicine JO Cleve Clin J Med FD Cleveland Clinic SP 135 OP 143 VO 29 IS 3 A1 Laurence K. Groves YR 1962 UL http://www.ccjm.org/content/29/3/135.abstract AB