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APA Citation
Houghton, D. E., Koh, I., Ellis, A., Key, N. S., Douce, D. R., Howard, G., Cushman, M., Safford, M., & Zakai, N. A. (n.d.). hemoglobin levels and coronary heart disease risk by age, race, and sex in the reasons for geographic and racial differences in stroke study (REGARDS). American journal of hematology, 95(3), 258–266. http://access.bl.uk/ark:/81055/vdc_100099986448.0x000046