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APA Citation
Silveira, M. F., Matijasevich, A., Menezes, A. M. B., Horta, B. L., Santos, I. S., Barros, A. J. D., Barros, F. C., & Victora, C. G. (2016). secular trends in smoking during pregnancy according to income and ethnic group: four population-based perinatal surveys in a Brazilian city. BMJ open, 6(2), . http://access.bl.uk/ark:/81055/vdc_100137789450.0x000008