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APA Citation
Rajaraman, P., Simpson, J., Neta, G., Berrington de Gonzalez, A., Ansell, P., Linet, M. S., Ron, E., & Roman, E. (2011). early life exposure to diagnostic radiation and ultrasound scans and risk of childhood cancer: case-control study. BMJ, 342, . http://access.bl.uk/ark:/81055/vdc_100151251903.0x000028