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mRnd: power calculations for Mendelian randomization

People who start with e-cigarettes may end up using both, and this increases health risks significantly. (V11)

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Local Guidelines and Compliance Zoom in on local regulations and guidelines

Efforts have been made to follow until 2001 all those not known to have died, with the exception of 17 who were struck off the medical register for unprofessional conduct, 467 who requested (mostly in the fifth decade of the study) no further questionnaires, and 2459 who were known to be alive but living abroad on 1 November 1971, when we withdrew them