TY - RPRT TI - Modelling ordinal responses from co-twin control studies. AU - F B Hu AU - J Goldberg AU - D Hedeker AU - W G Henderson PY - 1998 DO - 10.1002/(sici)1097-0258(19980515)17:9<957::aid-sim791>3.0.co;2-o UR - https://pubmed.ncbi.nlm.nih.gov/9612884/ ID - 9612884 ER -