TY - JOUR AU - Hsieh, F Y; Lavori, P W; Cohen, H J; Feussner, J R TI - An overview of variance inflation factors for sample-size calculation JO - Eval Health Prof IS - 03 VL - 26 PY - 2003 DO - 10.1177/0163278703255230 SP - 239 EP - 257 ER -