TY - JOUR A1 - Hammar, N. A1 - Kaprio, J. A1 - Hagström, U. A1 - Alfredsson, L. A1 - Koskenvuo, M. A1 - Hammar, T. T1 - Migration and mortality: A 20 year follow up of Finnish twin pairs with migrant co-twins in Sweden Y1 - 2002 DO - 10.1136/jech.56.5.362 VL - 56 IS - 5 ER -