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The use of pack-years to assess the risk of developing COPD or some other lung diseases has been criticized for being a measure based on the assumption that both smoking intensity and duration are of equal importance.11,16,26 However, some authors argue that it should continue to be used because of its simplicity and because it is a measure that provides information on the cumulative amount of tobacco consumption.9,16,27,28 In this study, COPD risk increases linearly with the increase in pack/years, an aspect that also occurs in the nonparametric model
Stigmasterol and sitosterol differ by only a double bond in their side chains, but their effects on the membrane were significantly different
As of 2015, the XHaler now supports lithium-ion batteries and has some power regulation capabilities
Through her collections she aims to offer well made and timeless pieces
