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incorporating a number of pop-ups, sliding and movable plates, transparent overlays, die-cut pages, stickers, and two posters

In 1997, researchers proposed a simpler classification (the Villefranche nomenclature) that reduced the number of types to six and gave them descriptive names based on their major features

Costs included consideration of (a) the initial cost to construct or purchase the air cleaner and (b) estimated operating costs, which is the price of the electricity used to power the air cleaner but not the cost of replacement filters

A systematic review and meta-analysis demonstrated a strong association between adherence to NRT and higher abstinence rates 12