RT Journal Article SR Electronic T1 Correlation does not always show a causal relationship JF Saudi Medical Journal JO Saudi Med J FD Prince Sultan Military Medical City SP 986 OP 986 VO 28 IS 6 A1 Buyukhatipoglu, Hakan A1 Homaei-Shandiz, Fatemeh YR 2007 UL http://smj.org.sa/content/28/6/986.abstract AB