RT Article T1 Pregnancy-related substance use in the United States during 1996-1998 JF Obstetrics & gynecology VO 101 IS 2 SP 374 OP 379 A1 Ebrahim, Shahul H. A2 Gfroerer, Joseph 1954- LA English YR 2003 UL https://krimdok.uni-tuebingen.de/Record/1912659646 DO 10.1016/S0029-7844(02)02588-7