Ben Honigman is a Professor of Emergency Medicine at the University of Colorado School of Medicine, where he’s been studying the effect of altitude on health since the late 1980s. He’s looked at cardiovascular disease and pulmonary effects at high elevations, and began to investigate suicide when he saw Renshaw’s paper first come out. He’s not convinced by their findings. He said that the research that's been done so far is based on observational data, which can’t provide causality—or hard proof that altitude causes depression.
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