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   1349188篇
  免费   103076篇
  国内免费   1916篇
耳鼻咽喉   17337篇
儿科学   43178篇
妇产科学   36361篇
基础医学   201601篇
口腔科学   36701篇
临床医学   126786篇
内科学   265724篇
皮肤病学   28882篇
神经病学   111311篇
特种医学   50386篇
外国民族医学   270篇
外科学   191156篇
综合类   26793篇
现状与发展   3篇
一般理论   639篇
预防医学   111483篇
眼科学   29555篇
药学   98541篇
  6篇
中国医学   2105篇
肿瘤学   75362篇
  2021年   11331篇
  2019年   11756篇
  2018年   15663篇
  2017年   11978篇
  2016年   13250篇
  2015年   15249篇
  2014年   20884篇
  2013年   31286篇
  2012年   43356篇
  2011年   45820篇
  2010年   26548篇
  2009年   25417篇
  2008年   42916篇
  2007年   45948篇
  2006年   45179篇
  2005年   44234篇
  2004年   42374篇
  2003年   40287篇
  2002年   39134篇
  2001年   57488篇
  2000年   58413篇
  1999年   49404篇
  1998年   14454篇
  1997年   13070篇
  1996年   13338篇
  1995年   12616篇
  1994年   11688篇
  1992年   39104篇
  1991年   38516篇
  1990年   37219篇
  1989年   36004篇
  1988年   33364篇
  1987年   32674篇
  1986年   31186篇
  1985年   29455篇
  1984年   22476篇
  1983年   19660篇
  1982年   11814篇
  1979年   21343篇
  1978年   15729篇
  1977年   13084篇
  1976年   12083篇
  1975年   13079篇
  1974年   15879篇
  1973年   15638篇
  1972年   14775篇
  1971年   13751篇
  1970年   13011篇
  1969年   12289篇
  1968年   11395篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
101.
102.
103.
104.
BackgroundThe aim of this paper is to assess the current state of quality and outcomes measures being reported for hepatic resections in the recent literature.MethodsMedline and PubMed databases were searched for English language articles published between 1 January 2002 and 30 April 2013. Two examiners reviewed each article and relevant citations for appropriateness of inclusion, which excluded papers of liver donor hepatic resections, repeat hepatectomies or meta-analyses. Data were extracted and summarized by two examiners for analysis.ResultsFifty-five studies were identified with suitable reporting to assess peri-operative mortality in hepatic resections. In only 35% (19/55) of the studies was the follow-up time explicitly stated, and in 47% (26/55) of studies peri-operative mortality was limited to in-hospital or 30 days. The time period in which complications were captured was not explicitly stated in 19 out of 28 studies. The remaining studies only captured complications within 30 days of the index operation (8/28). There was a paucity of quality literature addressing truly patient-centred outcomes.ConclusionQuality outcomes after a hepatic resection are inconsistently reported in the literature. Quality outcome studies for a hepatectomy should report mortality and morbidity at a minimum of 90 days after surgery.  相似文献   
105.
There are an estimated 56 million orphans and vulnerable children across sub-Saharan Africa. Communities typically care for orphan children through informal caring arrangements – either within or outside of kinship networks. Within Kenya, an estimated 250,000 children live on the streets. There is less research related to fostering attitudes of this special population than orphans and vulnerable children generally. Important research over the past decade has illuminated multiple ways in which children are made more vulnerable because of HIV, including parental death and street-migration from HIV-affected households. As HIV transitions from a terminal illness to a chronic, manageable one, research is also required to establish how parents living with HIV can be an asset to children. In this study, we assess whether mothers living with HIV were very willing to foster biologically-related children, and street-involved children, how these fostering attitudes differed from mothers not living with HIV, and whether differences in fostering attitudes by reported HIV status were mediated by social support, family functioning and general self-rated health. Approximately 40% of mothers living with HIV were very willing to provide long-term foster care to biologically-related or street-involved children. This was less than the percentage of mothers not living with HIV, who were very willing to foster biologically-related children (61%) or street-involved children (58%). Significant portions of these differences were explained by social support, family functioning and general self-rated health. Multi-sectoral approaches are suggested by these findings in order to improve the child-fostering capacity of mothers living with HIV. Improving social support, family functioning and general self-rated health among HIV-infected mothers may not only provide protective benefits for the mothers and their children, but also expand the community’s capacity to care for orphan and vulnerable children.  相似文献   
106.
107.
108.
109.
110.
Thyroid diseases are common, and use of levothyroxine is increasing worldwide. We investigated the influence of gender, race and socioeconomic status on the diagnosis and treatment of thyroid disorders using data from the Brazilian Longitudinal Study of Adult Health (ELSA-Brasil), a multicenter cohort study of civil servants (35-74 years of age) from six Brazilian cities. Diagnosis of thyroid dysfunction was by thyrotropin (TSH), and free thyroxine (FT4) if TSH was altered, and the use of specific medications. Multivariate logistic regression models were constructed using overt hyperthyroidism/hypothyroidism and levothyroxine use as dependent variables and sociodemographic characteristics as independent variables. The frequencies of overt hyper- and hypothyroidism were 0.7 and 7.4%, respectively. Using whites as the reference ethnicity, brown, and black race were protective for overt hypothyroidism (OR=0.76, 95%CI=0.64-0.89, and OR=0.53, 95%CI=0.43-0.67, respectively, and black race was associated with overt hyperthyroidism (OR=1.82, 95%CI=1.06-3.11). Frequency of hypothyroidism treatment was higher in women, browns, highly educated participants and those with high net family incomes. After multivariate adjustment, levothyroxine use was associated with female gender (OR=6.06, 95%CI=3.19-11.49) and high net family income (OR=3.23, 95%CI=1.02-10.23). Frequency of hyperthyroidism treatment was higher in older than in younger individuals. Sociodemographic factors strongly influenced the diagnosis and treatment of thyroid disorders, including the use of levothyroxine.  相似文献   
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