TY - JOUR A1 - Brønnum-Hansen, H. A1 - Östergren, O. A1 - Tarkiainen, L. A1 - Hermansen, Å A1 - Martikainen, P. A1 - Wel, K.A. A1 - Lundberg, O. T1 - Changes in life expectancy and lifespan variability by income quartiles in four Nordic countries: A study based on nationwide register data Y1 - 2021 DO - 10.1136/bmjopen-2020-048192 VL - 11 IS - 6 ER -