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Hatlen, P., Langhammer, A., Forsmo, S., Carlsen, S. M., & Amundsen, T. (2013). Bone mass density, fracture history, self-reported osteoporosis as proxy variables for estrogen and the risk of non-small-cell lung cancer--a population based cohort study, the HUNT study: are proxy variables friends or faults? Lung Cancer, 81(1), 39–46.
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