Esophageal Squamous Cell Carcinoma of the the upper third of the Esophagus that invades the subglottic region
Markuljak, I., Ivankova, J
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According to the time when different cities enacted the smoking control policy in public places, the sample intervals were divided into the first 4 years, the first 2 years, the year of enactment, the last 2 years, the last 4 years, the last 6 years and the last 8 years of enactment of the smoking control policy in public places, thereby constructing 7 indicator variables
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