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   48603篇
  免费   4102篇
  国内免费   115篇
耳鼻咽喉   380篇
儿科学   1944篇
妇产科学   1359篇
基础医学   7035篇
口腔科学   991篇
临床医学   6673篇
内科学   9346篇
皮肤病学   907篇
神经病学   5003篇
特种医学   1137篇
外科学   4427篇
综合类   495篇
一般理论   63篇
预防医学   5939篇
眼科学   695篇
药学   2756篇
  2篇
中国医学   59篇
肿瘤学   3609篇
  2024年   42篇
  2023年   404篇
  2022年   292篇
  2021年   1311篇
  2020年   967篇
  2019年   1433篇
  2018年   1568篇
  2017年   1238篇
  2016年   1359篇
  2015年   1441篇
  2014年   1843篇
  2013年   2699篇
  2012年   3748篇
  2011年   3872篇
  2010年   2128篇
  2009年   1907篇
  2008年   3157篇
  2007年   3244篇
  2006年   3194篇
  2005年   3000篇
  2004年   2920篇
  2003年   2670篇
  2002年   2413篇
  2001年   451篇
  2000年   352篇
  1999年   392篇
  1998年   551篇
  1997年   420篇
  1996年   374篇
  1995年   355篇
  1994年   281篇
  1993年   286篇
  1992年   234篇
  1991年   202篇
  1990年   172篇
  1989年   134篇
  1988年   154篇
  1987年   107篇
  1986年   113篇
  1985年   118篇
  1984年   110篇
  1983年   111篇
  1982年   130篇
  1981年   121篇
  1980年   101篇
  1979年   67篇
  1978年   71篇
  1977年   51篇
  1976年   49篇
  1973年   39篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
2.

Microdeletions encompassing 14q11.2 locus, involving SUPT16H and CHD8, were shown to cause developmental delay, intellectual disability, autism spectrum disorders and macrocephaly. Variations leading to CHD8 haploinsufficiency or loss of function were also shown to lead to a similar phenotype. Recently, a 14q11.2 microduplication syndrome, encompassing CHD8 and SUPT16H, has been described, highlighting the importance of a tight control of at least CHD8 gene-dosage for a normal development. There have been only a few reports of 14q11.2 microduplications. Patients showed variable neurodevelopmental issues of variable severity. Breakpoints of the microduplications were non-recurrent, making interpretation of the CNV and determination of their clinical relevance difficult. Here, we report on two patients with 14q11.2 microduplication encompassing CHD8 and SUPT16H, one of whom had normal intelligence. Review of previous reports describing patients with comparable microduplications allowed for a more precise delineation of the condition and widening of the phenotypic spectrum.

  相似文献   
3.
4.
Purpose: Family psychosocial risk in pediatric oncology can be assessed using the Psychosocial Assessment Tool (PAT), a brief parent report screener based on the Pediatric Psychosocial Preventative Health Model (PPPHM; universal, targeted, and clinical). However, little is known about risk over the course of treatment and its association with medical and psychosocial healthcare utilization. Methods: Primary caregivers of children with cancer participated in this prospective multisite investigation, completing the PAT at diagnosis (T1; n = 396) and 6 months later (T2; n = 304). Healthcare utilization data were extracted from electronic health records. Results: The distribution of PPPHM risk levels at T1 and T2 was highly consistent for the samples. Two‐thirds of families remained at the same level of risk, 18% decreased and 16% increased risk level. Risk was not related to sociodemographic or treatment variables. The PAT risk score correlated with psychosocial contacts over the 6‐month period. Conclusions: Although the majority of families reported universal (low) risk on the PAT and were stable in their risk level over 6 months, reassessing risk is helpful in identifying those families who report higher level of risk during treatment than at diagnosis. PAT scores were related to psychosocial services that are provided to most but not all families and could be tailored more specifically to match risk and delivery of evidence‐based care.  相似文献   
5.
6.
7.
ContextIt is especially important that patients are well informed when making high-stakes, preference-sensitive decisions like those on the Physician Orders for Life-Sustaining Treatment (POLST) form. However, there is currently no way to easily evaluate whether patients understand key concepts when making these important decisions.ObjectivesTo develop a POLST knowledge survey.MethodsExpert (n = 62) ratings of key POLST facts were used to select items for a POLST knowledge survey. The survey was administered to nursing facility residents (n = 97) and surrogate decision-makers (n = 112). A subset (n = 135) were re-administered the survey after a standardized advance care planning discussion to assess the scale's responsiveness to change.ResultsThe 19-item survey demonstrated adequate reliability (α = 0.72.). Residents' scores (x = 11.4, standard deviation 3.3) were significantly lower than surrogate scores (x = 14.7, standard deviation 2.5) (P < 0.001). Scores for both groups increased significantly after administration of a standardized advance care planning discussion (P < 0.001). Although being a surrogate, age, race, education, cognitive functioning, and health literacy were significantly associated with higher POLST Knowledge Survey scores in univariate analyses, only being a surrogate (P < 0.001) and being white (P = 0.028) remained significantly associated with higher scores in multivariate analyses.ConclusionThe 19-item POLST Knowledge Survey demonstrated adequate reliability and responsiveness to change. Findings suggest the survey could be used to identify knowledge deficits and provide targeted education to ensure adequate understanding of key clinical decisions when completing POLST.  相似文献   
8.
9.
10.
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