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   2415897篇
  免费   201913篇
  国内免费   4320篇
耳鼻咽喉   34858篇
儿科学   74410篇
妇产科学   64197篇
基础医学   341469篇
口腔科学   69392篇
临床医学   219644篇
内科学   474501篇
皮肤病学   48904篇
神经病学   205660篇
特种医学   98130篇
外国民族医学   902篇
外科学   366248篇
综合类   56450篇
现状与发展   2篇
一般理论   1050篇
预防医学   195895篇
眼科学   56465篇
药学   180994篇
  4篇
中国医学   4402篇
肿瘤学   128553篇
  2018年   25510篇
  2017年   19869篇
  2016年   21814篇
  2015年   24659篇
  2014年   35480篇
  2013年   53282篇
  2012年   72481篇
  2011年   76028篇
  2010年   44501篇
  2009年   42913篇
  2008年   71980篇
  2007年   76390篇
  2006年   77048篇
  2005年   74876篇
  2004年   71808篇
  2003年   69273篇
  2002年   68277篇
  2001年   113839篇
  2000年   117720篇
  1999年   99056篇
  1998年   26865篇
  1997年   24333篇
  1996年   24259篇
  1995年   24943篇
  1994年   23495篇
  1993年   21853篇
  1992年   80234篇
  1991年   77237篇
  1990年   74391篇
  1989年   71614篇
  1988年   66513篇
  1987年   65446篇
  1986年   61947篇
  1985年   59021篇
  1984年   44628篇
  1983年   37981篇
  1982年   23050篇
  1981年   20449篇
  1979年   41613篇
  1978年   29185篇
  1977年   24473篇
  1976年   22921篇
  1975年   24097篇
  1974年   29787篇
  1973年   28229篇
  1972年   26441篇
  1971年   24390篇
  1970年   22914篇
  1969年   21236篇
  1968年   19273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