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   264366篇
  免费   13497篇
  国内免费   542篇
耳鼻咽喉   3552篇
儿科学   8014篇
妇产科学   5303篇
基础医学   37233篇
口腔科学   6012篇
临床医学   21455篇
内科学   58888篇
皮肤病学   6552篇
神经病学   23706篇
特种医学   8302篇
外国民族医学   102篇
外科学   34611篇
综合类   1218篇
一般理论   80篇
预防医学   23136篇
眼科学   4979篇
药学   18206篇
中国医学   734篇
肿瘤学   16322篇
  2023年   1387篇
  2022年   976篇
  2021年   4170篇
  2020年   2536篇
  2019年   4692篇
  2018年   8365篇
  2017年   5525篇
  2016年   5524篇
  2015年   6262篇
  2014年   6918篇
  2013年   10836篇
  2012年   18346篇
  2011年   18495篇
  2010年   9422篇
  2009年   7370篇
  2008年   15906篇
  2007年   17046篇
  2006年   15703篇
  2005年   15479篇
  2004年   14463篇
  2003年   13245篇
  2002年   12423篇
  2001年   6366篇
  2000年   6360篇
  1999年   5719篇
  1998年   1206篇
  1997年   972篇
  1996年   879篇
  1995年   831篇
  1992年   3300篇
  1991年   2971篇
  1990年   2817篇
  1989年   2566篇
  1988年   2419篇
  1987年   2247篇
  1986年   2142篇
  1985年   1953篇
  1984年   1480篇
  1983年   1274篇
  1979年   1243篇
  1978年   883篇
  1977年   822篇
  1975年   824篇
  1974年   1006篇
  1973年   1013篇
  1972年   951篇
  1971年   933篇
  1970年   873篇
  1969年   910篇
  1968年   795篇
排序方式: 共有10000条查询结果,搜索用时 281 毫秒
1.
Journal of Immigrant and Minority Health - COVID-19 has disproportionally affected underrepresented minorities (URM) and low-income immigrants in the United States. The aim of the study is to...  相似文献   
2.
3.
The aim of this study is to evaluate the prevalence, determinants and prognostic value of pain at diagnosis in patients with desmoid-type fibromatosis (DF). We selected patients from the ALTITUDES cohort (NCT02867033), managed by surgery, active surveillance or systemic treatments, with pain assessment at diagnosis. Patients were invited to fill QLQ-C30 questionnaire and Hospital Anxiety Depression Scale. Determinants were identified using logistic models. Prognostic value on event-free survival (EFS) was evaluated using the Cox model. Overall, 382 patients were included in the current study (median age: 40.2 years; 117 men). The prevalence of pain was 36%, without significant difference according to first-line treatment (P = .18). In the multivariate analysis, pain was significantly associated with tumor size >50 mm (P = .013) and tumor site (P < .001); pain was more frequent in the neck and shoulder locations (odds ratio: 3.05 [1.27-7.29]). Pain at baseline was significantly associated with poor quality of life (P < .001), depression (P = .02), lower performance status (P = .03) and functional impairment (P = .001); we also observed a nonsignificant association with anxiety (P = .10). In the univariate analysis, baseline pain was associated with poor EFS; the 3-year EFS was 54% in patients with pain compared to 72% in those without pain. After adjustment for sex, age, size and line of treatment, pain was still associated with poor EFS (hazard ratio: 1.82 [1.23-2.68], P = .003). One third of recently diagnosed patients with DF experienced pain, especially those with larger tumors and neck/shoulder locations. Pain was associated with unfavorable EFS after adjustment for the confounders.  相似文献   
4.
5.
6.
7.
Purpose

A systematic review was undertaken to determine whether research supports: (i) an association between income inequality and adult mental health when measured at the subnational level, and if so, (ii) in a way that supports the Income Inequality Hypothesis (i.e. between higher inequality and poorer mental health) or the Mixed Neighbourhood Hypothesis (higher inequality and better mental health).

Methods

Systematic searches of PsycINFO, Medline and Web of Science databases were undertaken from database inception to September 2020. Included studies appeared in English-language, peer-reviewed journals and incorporated measure/s of objective income inequality and adult mental illness. Papers were excluded if they focused on highly specialised population samples. Study quality was assessed using a custom-developed tool and data synthesised using the vote-count method.

Results

Forty-two studies met criteria for inclusion representing nearly eight million participants and more than 110,000 geographical units. Of these, 54.76% supported the Income Inequality Hypothesis and 11.9% supported the Mixed Neighbourhood Hypothesis. This held for highest quality studies and after controlling for absolute deprivation. The results were consistent across mental health conditions, size of geographical units, and held for low/middle and high income countries.

Conclusions

A number of limitations in the literature were identified, including a lack of appropriate (multi-level) analyses and modelling of relevant confounders (deprivation) in many studies. Nonetheless, the findings suggest that area-level income inequality is associated with poorer mental health, and provides support for the introduction of social, economic and public health policies that ameliorate the deleterious effects of income inequality.

Clinical registration number

PROSPERO 2020 CRD42020181507.

  相似文献   
8.
9.
10.
The adrenal cortex gives rise to a biologically heterogenous group of neoplasms, each with a distinct morphology, antigen expression and molecular profile. Adrenal cortical adenomas have excellent prognosis and are usually cured by surgical resection alone, while adrenal cortical carcinomas are very aggressive tumors with a poor prognosis regardless of therapy. These tumors are rare and often challenging for a pathologist to diagnose, as significant overlap exists between benign and malignant lesions in some cases. In this review, we attempt to summarize most important histologic and clinical features of adrenal cortical adenomas and carcinomas, clarify the use of different grading systems, the use of special stains and the differential diagnosis for practicing pathologists. Most relevant hereditary syndromes associated with adrenal cortical tumors are listed. Updates in molecular alterations in adrenal cortical neoplasms and hyperplastic diseases as well as their clinical significance and potential therapeutic implications are also discussed.  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