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   2357453篇
  免费   198064篇
  国内免费   4176篇
耳鼻咽喉   34237篇
儿科学   72520篇
妇产科学   62931篇
基础医学   332136篇
口腔科学   67465篇
临床医学   214357篇
内科学   464273篇
皮肤病学   47897篇
神经病学   199297篇
特种医学   95852篇
外国民族医学   886篇
外科学   359393篇
综合类   56150篇
现状与发展   1篇
一般理论   977篇
预防医学   189190篇
眼科学   55327篇
药学   177090篇
  4篇
中国医学   4258篇
肿瘤学   125452篇
  2018年   24219篇
  2016年   20577篇
  2015年   23287篇
  2014年   33545篇
  2013年   50849篇
  2012年   68762篇
  2011年   72301篇
  2010年   42486篇
  2009年   40888篇
  2008年   68777篇
  2007年   73109篇
  2006年   74018篇
  2005年   72059篇
  2004年   69360篇
  2003年   66882篇
  2002年   66104篇
  2001年   112296篇
  2000年   116235篇
  1999年   97692篇
  1998年   26167篇
  1997年   23778篇
  1996年   23737篇
  1995年   24456篇
  1994年   23025篇
  1993年   21436篇
  1992年   79275篇
  1991年   76380篇
  1990年   73540篇
  1989年   70792篇
  1988年   65788篇
  1987年   64755篇
  1986年   61295篇
  1985年   58370篇
  1984年   44151篇
  1983年   37546篇
  1982年   22795篇
  1981年   20229篇
  1980年   18934篇
  1979年   41222篇
  1978年   28911篇
  1977年   24246篇
  1976年   22753篇
  1975年   23902篇
  1974年   29585篇
  1973年   28008篇
  1972年   26205篇
  1971年   24142篇
  1970年   22725篇
  1969年   21062篇
  1968年   19116篇
排序方式: 共有10000条查询结果,搜索用时 15 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