Estimating the effect of timing of earned income tax credit refunds on perinatal outcomes: a quasi-experimental study of California births.

Karasek D, Batra A, Baer RJ, Butcher BDC, Feuer S, Fuchs JD, Kuppermann M, Gomez AM, Prather AA, Pantell M, Rogers E, Snowden JM, Torres J, Rand L, Jelliffe-Pawlowski L, Hamad R