Electronic cigarette use in relation to changes in smoking status and respiratory symptoms Autor Linnéa Hedman<sup>+<sup>, Gustaf Lyytinen<sup>+<sup>, Helena Backman, Magnus Lundbäck, Caroline Stridsman, Anne Lindberg, Hannu Kankaanranta, Lina Rönnebjerg, Eva Rönmark, Linda Ekerljung

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