目的研究深圳市中学生网络成瘾的发生情况和网络成瘾的原因。
To study the incidence of Internet addiction and analyze the causation in middle school students of Shenzhen City.
目的为了研究大隐静脉曲张手术后复发的原因和再手术治疗的效果。
Objectives To study the reason of postoperative recurrence and the effect of re-operation for the patients with saphenous vein varices.
目的研究不明原因的消化道出血的诊断和治疗。
Objective To study the diagnoses and treatment of alimentary tract bleeding of unknown causes.
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