I suspect the authors chose the latent class approach because it allowed them to make use of all the data, and to include participants with missing data at some timepoints, and this was probably a sensible decision
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As cigarettes began to dominate the market, in 1935 Gus Picard, the nephew of the Joseph Picard traveled to England to try and interest the large Carreras Company of London to establish several of its cigarette brands in Canada
Imperial has identified Italy, Greece, Russia, Turkey and the US as growth markets, while the UK, with its 10 million smokers and where the company has a higher market share, is classed a "returns market".
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Most of the meta-analyses in this study had moderate and statistically significant heterogeneity