首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   4665951篇
  免费   386855篇
  国内免费   15800篇
耳鼻咽喉   67364篇
儿科学   148652篇
妇产科学   124878篇
基础医学   703090篇
口腔科学   133123篇
临床医学   426902篇
内科学   841809篇
皮肤病学   112586篇
神经病学   394383篇
特种医学   187056篇
外国民族医学   1155篇
外科学   711089篇
综合类   138755篇
现状与发展   23篇
一般理论   2778篇
预防医学   394098篇
眼科学   111931篇
药学   332969篇
  20篇
中国医学   11979篇
肿瘤学   223966篇
  2021年   50326篇
  2019年   59005篇
  2018年   74757篇
  2017年   56902篇
  2016年   63409篇
  2015年   76095篇
  2014年   111070篇
  2013年   176726篇
  2012年   131194篇
  2011年   137175篇
  2010年   127489篇
  2009年   128864篇
  2008年   123647篇
  2007年   132244篇
  2006年   140609篇
  2005年   135565篇
  2004年   136415篇
  2003年   126274篇
  2002年   116214篇
  2001年   175871篇
  2000年   172615篇
  1999年   155658篇
  1998年   68439篇
  1997年   63910篇
  1996年   61685篇
  1995年   62879篇
  1994年   57130篇
  1993年   52772篇
  1992年   118366篇
  1991年   114093篇
  1990年   109151篇
  1989年   106238篇
  1988年   98275篇
  1987年   97005篇
  1986年   91843篇
  1985年   89960篇
  1984年   74210篇
  1983年   65508篇
  1982年   50708篇
  1981年   46984篇
  1980年   44052篇
  1979年   66236篇
  1978年   52425篇
  1977年   45839篇
  1976年   42861篇
  1975年   42798篇
  1974年   48999篇
  1973年   47034篇
  1972年   44117篇
  1971年   40613篇
排序方式: 共有10000条查询结果,搜索用时 203 毫秒
991.
992.
993.
994.
995.
996.
Few studies have examined the effects of parental incarceration (PI) on outcomes above and beyond other risk and adverse childhood experiences (ACEs). The objectives of this study were to (1) the associations between PI and mental health problems (attention, externalizing, internalizing, and total behavioral problems) and (2) the mediating role of current socioeconomic status and cumulative ACEs. An observational and cross-sectional design was employed. Analyses included hierarchical multivariable linear regression modeling. The analytic sample included 613 adolescents (11–17?years). On average, youth exposed to PI experienced three times as many ACEs compared with youth unexposed. Youth exposed to PI were more likely to have behavioral problems than their unexposed peers. The main effect for all models was attenuated by current economic hardship as well as exposure to increasing numbers of ACEs. Exposure to PI can be viewed as a marker of accumulative risk for intervention since youth impacted by PI are more likely to experience behavioral difficulties and associated adverse childhood experiences. Due to the associated adversity that impact youth exposed to PI, mental health providers need to be able to identify and screen for symptoms associated with trauma.  相似文献   
997.
998.
PurposeCongenital high airway obstruction syndrome (CHAOS) is a devastating fetal condition of complete airway discontinuity resulting in significant hydrops and extreme lung hyperplasia. It is universally fatal with survival reported only in the rare spontaneous fistulization or EXIT intervention (Ex Utero Intrapartum Treatment). Even in these cases, mortality remains high, and current investigations are targeting prenatal interventions. This report describes our experience with management and fetal interventions for CHAOS, including laser laryngotomy.MethodsWe retrospectively reviewed all patients diagnosed with CHAOS at a single academic institution between 2006 and 2017.ResultsFifteen patients were identified. Eight had obstruction at the trachea and seven at the larynx. In the laryngeal obstructions, three expired shortly after birth, and one survived after spontaneous fistulization and subsequent EXIT to tracheostomy. The remaining three underwent in-utero treatment with laser laryngotomy. One had preterm premature rupture of membranes (PPROM), delivered 3 days post-operatively, and died. Two underwent EXIT to tracheostomy with one surviving to discharge and is currently 2 years old.ConclusionOur study demonstrates the outcomes of a large series of patients diagnosed with CHAOS. While mortality remains high, options for fetal intervention are being explored to allow alterations in the prenatal natural history and improve postnatal outcomes.Type of StudyRetrospective Treatment Study.Level of EvidenceLevel IV.  相似文献   
999.
1000.
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号