All had a biopsy of the esophagus before and after the study.
在研究前后进行食道的组织活检。
DESIGN: a randomized self controlled study before and after treatment.
设计：随机、治疗前后自身对照研究。
Objective To study the value of ultrasound in incisional hernia before and after its operation.
目的探讨超声对切口疝修补手术前后检查的应用价值。
Objective: to study the effect of nursing before and after operation of ectopic pregnancy.
目的：研究精心的围手术期护理对宫外孕患者的预后影响。
Objective: to study the effect of nursing before and after operation of ectopic pregnancy.
目的：研究精心的围手术期护理对宫外孕患者的预后影响。
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