Mortality in Relation to Smoking: 50 Years' Observations on Male British Doctors
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[1] Richard Doll,et al. Mortality in relation to smoking: 22 years' observations on female British doctors. , 1980, British medical journal.
[2] W. Seeger,et al. Sildenafil Increased Exercise Capacity during Hypoxia at Low Altitudes and at Mount Everest Base Camp , 2004, Annals of Internal Medicine.