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   135678篇
  免费   10382篇
  国内免费   644篇
耳鼻咽喉   1663篇
儿科学   3506篇
妇产科学   2459篇
基础医学   16960篇
口腔科学   2907篇
临床医学   13882篇
内科学   28152篇
皮肤病学   1796篇
神经病学   11871篇
特种医学   5399篇
外科学   21910篇
综合类   1915篇
现状与发展   1篇
一般理论   174篇
预防医学   12464篇
眼科学   2903篇
药学   9624篇
  2篇
中国医学   180篇
肿瘤学   8936篇
  2023年   760篇
  2022年   481篇
  2021年   2396篇
  2020年   1653篇
  2019年   2446篇
  2018年   3119篇
  2017年   2306篇
  2016年   2425篇
  2015年   2902篇
  2014年   4233篇
  2013年   6273篇
  2012年   8939篇
  2011年   9490篇
  2010年   5397篇
  2009年   5027篇
  2008年   8467篇
  2007年   9026篇
  2006年   8620篇
  2005年   8782篇
  2004年   8416篇
  2003年   7894篇
  2002年   7690篇
  2001年   1298篇
  2000年   1061篇
  1999年   1344篇
  1998年   1405篇
  1997年   1130篇
  1996年   1047篇
  1995年   1204篇
  1994年   1017篇
  1993年   975篇
  1992年   832篇
  1991年   867篇
  1990年   753篇
  1989年   743篇
  1988年   748篇
  1987年   751篇
  1986年   753篇
  1985年   833篇
  1984年   888篇
  1983年   849篇
  1982年   1107篇
  1981年   1138篇
  1980年   941篇
  1979年   601篇
  1978年   652篇
  1977年   573篇
  1976年   501篇
  1975年   449篇
  1974年   458篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
2.
3.
4.
Gastrostomy tube placement is a procedure that achieves enteral access for nutrition, decompression, and medication administration. Preprocedural evaluation and selection of patients is necessary to provide optimal benefit and reduce the risk of adverse events (AEs). Appropriate indications, contraindications, ethical considerations, and comorbidities of patients referred for gastrostomy placement should be weighed and balanced. Additionally, endoscopist should consider either a transoral or transabdominal approach is appropriate, and radiologic or surgical gastrostomy tube placement is needed. However, medical history, physical examination, and imaging prior to the procedure should be considered to tailor the appropriate approach and reduce the risk of AEs.  相似文献   
5.
6.
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   
7.
  • Children with cancer receive many medications outside the hospital administered by their caregivers.
  • The study by Walsh et al. shows the number and types of medication errors in these patients. The study includes data from three different centers.
  • Importantly, the study shows the types of errors that cause harm. The authors describe how the harmful errors can be prevented.
  • We suggest ways these results can be used to identify which patients and families will benefit from additional attention. Providing more help at clinic and in the home may help prevent harmful medication errors in children with cancer.
  相似文献   
8.
9.
Isolated patellofemoral arthritis is an increasingly recognized entity, and is usually associated with previous patellofemoral dysplasia or instability. Patellofemoral arthroplasty (PFA) has evolved significantly in recent years, both in terms of implant design and importantly in the understanding of appropriate patient selection. This review outlines the indications and investigations for PFA, provides a brief history of the development of contemporary implants, and presents the clinical outcomes for the prostheses most commonly used in the UK. In addition, it provides a detailed surgical technique for implantation of an onlay implant, with tips on how to optimize patellofemoral biomechanics and thus achieve a consistently good outcome.  相似文献   
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