Infant and childhood growth and frailty in old age : the Helsinki Birth Cohort Study - Haapanen, M. J.; Perälä, M. M.; Osmond, C.; Salonen, M. K.; Kajantie, E.; Rantanen, Taina; Simonen, M.; Pohjolainen, P.; Eriksson, J. G.; von Bonsdorff; Mikaela (Aging Clinical and Experimental Research, 2019)