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Lam TH, Kung IT, Wong CM, Lam WK, Kleevens JW, Saw D, Hsu C, Seneviratne S, Lam SY, Lo KK, Chan WC: Smoking, passive smoking and histological types in lung cancer in Hong Kong Chinese women

Avoid placing it in direct sunlight and extremely cold areas

This portion of the model specifies how much of the variation in smoking is due to changing social environments that influence the probability of smoking for all individuals concurrently (i.e., period effect) or changing population composition attributable to collective event experience such as being born in the same year (i.e., cohort effect)

The coil is then checked for resistance and consistency