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Validation of Self-Reported Smartphone Usage Against Objectively-Measured Smartphone Usage in Hong Kong Chinese Adolescents and Young Adults

Lee PH, Tse ACY, Wu CST, Mak YW, Lee U

Objective This study evaluated the validity of self-reported smartphone usage data against objectively-measured smartphone usage data by directly tracking the activities in the participants’ smartphone among Chinese adolescents and young...
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Comparative Cohort Study for Expansion of Lateral Recess and Facet Joint Injury after Biportal Endoscopic Ipsilateral Decompression and Contralateral Decompression

Yeung Yk, Park Cw, Jun SG, Park Jh, Tse ACy

Study Design: This was a retrospective longitudinal study of patients operated on consecutively in a single center from May to October 2019. Purpose: The aim in biportal interlaminar endoscopic decompression surgery...
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