TY - CPAPER AU - Ivers R. BT - Australasian Epidemiological Association Annual Scientific Meeting CY - Wellington, New Zealand LA - eng LB - injuryconference presentation PP - Wellington, New Zealand PY - 2002 T2 - Australasian Epidemiological Association Annual Scientific Meeting TI - Effect of length of follow-up on relative risk in longitudinal data. Contributed paper session ER -