RT Journal Article SR Electronic T1 SAS program for testing the difference between two correlated correlation coefficients. JF Occupational and Environmental Medicine JO Occup Environ Med FD BMJ Publishing Group Ltd SP 141 OP 141 DO 10.1136/oem.51.2.141 VO 51 IS 2 A1 Lee, J YR 1994 UL http://oem.bmj.com/content/51/2/141.1.abstract AB