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   2505528篇
  免费   200704篇
  国内免费   4574篇
耳鼻咽喉   36340篇
儿科学   78509篇
妇产科学   67511篇
基础医学   351209篇
口腔科学   72100篇
临床医学   226371篇
内科学   489334篇
皮肤病学   51660篇
神经病学   207659篇
特种医学   104202篇
外国民族医学   961篇
外科学   381791篇
综合类   57059篇
现状与发展   1篇
一般理论   979篇
预防医学   202298篇
眼科学   58585篇
药学   187125篇
  6篇
中国医学   4362篇
肿瘤学   132744篇
  2018年   27183篇
  2017年   22117篇
  2016年   23243篇
  2015年   27309篇
  2014年   37056篇
  2013年   53615篇
  2012年   76689篇
  2011年   76061篇
  2010年   44234篇
  2009年   43974篇
  2008年   70349篇
  2007年   75271篇
  2006年   76365篇
  2005年   81230篇
  2004年   79946篇
  2003年   73748篇
  2002年   68704篇
  2001年   114829篇
  2000年   117303篇
  1999年   101110篇
  1998年   26554篇
  1997年   24015篇
  1996年   23968篇
  1995年   24702篇
  1994年   23258篇
  1993年   21629篇
  1992年   83583篇
  1991年   81118篇
  1990年   78542篇
  1989年   75558篇
  1988年   70209篇
  1987年   68972篇
  1986年   65499篇
  1985年   62087篇
  1984年   46720篇
  1983年   39614篇
  1982年   23503篇
  1981年   20781篇
  1979年   44039篇
  1978年   30658篇
  1977年   25619篇
  1976年   23976篇
  1975年   25884篇
  1974年   32043篇
  1973年   30160篇
  1972年   28432篇
  1971年   26360篇
  1970年   24851篇
  1969年   23092篇
  1968年   20948篇
排序方式: 共有10000条查询结果,搜索用时 62 毫秒
1.
The International Journal of Cardiovascular Imaging - Global longitudinal strain (GLS) has proven to be a powerful prognostic marker in various patient populations, but the prognostic value of...  相似文献   
2.
3.
4.
5.
6.
The Earth’s mean surface temperature is already approximately 1.1°C higher than pre-industrial levels. Exceeding a mean 1.5°C rise by 2050 will make global adaptation to the consequences of climate change less possible. To protect public health, anaesthesia providers need to reduce the contribution their practice makes to global warming. We convened a Working Group of 45 anaesthesia providers with a recognised interest in sustainability, and used a three-stage modified Delphi consensus process to agree on principles of environmentally sustainable anaesthesia that are achievable worldwide. The Working Group agreed on the following three important underlying statements: patient safety should not be compromised by sustainable anaesthetic practices; high-, middle- and low-income countries should support each other appropriately in delivering sustainable healthcare (including anaesthesia); and healthcare systems should be mandated to reduce their contribution to global warming. We set out seven fundamental principles to guide anaesthesia providers in the move to environmentally sustainable practice, including: choice of medications and equipment; minimising waste and overuse of resources; and addressing environmental sustainability in anaesthetists’ education, research, quality improvement and local healthcare leadership activities. These changes are achievable with minimal material resource and financial investment, and should undergo re-evaluation and updates as better evidence is published. This paper discusses each principle individually, and directs readers towards further important references.  相似文献   
7.
8.
9.
10.

Background

Survival in cancer patients is associated with a multitude of biological, social, and psychological factors. Although it is well established that all these factors add to overall mortality, it is not well understood how the predictive power of these parameters changes in a comprehensive model and over time.

Methods

Patients who attended the authors’ outpatient clinic were invited to participate. The authors followed 5180 mixed cancer patients (51.1% female; mean age, 59.1 years [SD = 13.8]) for up to 16 years and analyzed biological (age, sex, cancer site, anemia), psychological (anxiety, depression), and social variables (marital status, education, employment status) potentially predicting overall survival in a Cox proportional hazards model.

Results

The median survival time for the entire sample was 4.3 years (95% confidence interval, 4.0–4.7). The overall survival probabilities for 1 and 10 years were 76.8% and 38.0%, respectively. Following an empirical approach, the authors split the time interval into five periods: acute, subacute, short-term, medium-term, and long-term. A complex pattern of variables predicted overall survival differently in the five periods. Biological parameters were important throughout most of the time, social parameters were either time-independent predictors or tended to be more important in the longer term. Of the psychological parameters, only depression was a significant predictor and lost its predictive power in the long-term.

Conclusions

The findings of this study allow the development of comprehensive patient-specific models of risk and resilience factors addressing biopsychosocial needs of cancer patients, paving the way for a personalized treatment plan that goes beyond biomedical cancer care.  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