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Just as the time necessary for conveying the liquid content of a large container through a pipe (at a given flow velocity) is determined by the ratio of the volume of the liquid to the cross-sectional area of the pipe, the LMTR equals the ratio of two numbers, one depending on the source and fidelity criterion, the other depending on the channel

& Henningfield, J

This process, called vaping, is often suggested as a safer alternative to smoking because of the absence of tobacco

The low participation rate at baseline, in line with other Swedish studies from the same years, could affect external validity

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