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   68817篇
  免费   5095篇
  国内免费   215篇
耳鼻咽喉   823篇
儿科学   1757篇
妇产科学   991篇
基础医学   9005篇
口腔科学   1044篇
临床医学   7281篇
内科学   14897篇
皮肤病学   841篇
神经病学   6721篇
特种医学   2334篇
外国民族医学   5篇
外科学   11959篇
综合类   760篇
一般理论   49篇
预防医学   4902篇
眼科学   1319篇
药学   4760篇
中国医学   86篇
肿瘤学   4593篇
  2024年   67篇
  2023年   514篇
  2022年   892篇
  2021年   2064篇
  2020年   1261篇
  2019年   1865篇
  2018年   2287篇
  2017年   1593篇
  2016年   1681篇
  2015年   1959篇
  2014年   2795篇
  2013年   3511篇
  2012年   5479篇
  2011年   5679篇
  2010年   3042篇
  2009年   2784篇
  2008年   4572篇
  2007年   4674篇
  2006年   4451篇
  2005年   4278篇
  2004年   3840篇
  2003年   3652篇
  2002年   3278篇
  2001年   594篇
  2000年   481篇
  1999年   543篇
  1998年   692篇
  1997年   528篇
  1996年   446篇
  1995年   369篇
  1994年   338篇
  1993年   307篇
  1992年   327篇
  1991年   274篇
  1990年   232篇
  1989年   221篇
  1988年   228篇
  1987年   193篇
  1986年   184篇
  1985年   158篇
  1984年   175篇
  1983年   141篇
  1982年   142篇
  1981年   125篇
  1980年   146篇
  1979年   97篇
  1978年   91篇
  1977年   78篇
  1976年   71篇
  1974年   68篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
21.
22.
With their unique perspectives in the identification, design, promotion, and evaluation of cancer patient education programs and services, the National Cancer Institute and the American Cancer Society have the abilities to meet a wide variety of cancer patient education needs. With federal support and connections to national organizations and the comprehensive and clinical cancer center networks, the National Cancer Institute has access to nationwide experts in medical care and the resources to develop, design, and promote quality, state-of-the-art education programs. The American Cancer Society, with its strong volunteer community base, can pull together local expertise and collaborate with local organizations to meet the special needs of local population groups. In addition, the American Cancer Society volunteer committees have the flexibility to individualize programming and resources to answer specific patient/family education problems. As the number of people affected by cancer continues to raise, and as organizations realize the need to maximize their resources with collaborative efforts, the National Cancer Institute and the American Cancer Society are challenged to focus their energies on the patient education initiatives that build upon and combine their unique strengths.  相似文献   
23.
24.
Clinical outcomes data can be used to facilitate patient management decisions, assess clinician and organizational performance, and to provide evidence for the effectiveness of surgery and rehabilitation. The validity of the inferences made from outcomes data are dependent on the validity of the outcomes measures themselves and the circumstances under which the data were collected, analyzed, and interpreted. Clinical outcomes may include measures of impairment of body structure and function, activity limitation, and participation restriction. However, because the relationship between impairment and the resulting activity limitation and participation restriction is not direct, and because activity limitations and participation restrictions are of the utmost concern to the athlete, the primary clinical outcome should be measures of activity limitation and participation restriction. Activity limitation and participation restriction may be measured either through direct observation of performance or by general or specific measures of health related quality of life. Clinical outcomes data must be collected systematically to ensure valid inferences from the data.  相似文献   
25.
There is limited information regarding oral health status and other predictors of oral health‐related quality of life. An association between oral health status and perceived oral health‐related quality of life (OHQOL) might help clinicians motivate patients to prevent oral diseases and improve the outcome of some dental public health programs. This study evaluated the relationship between older persons' OHQOL and their functional dentition, caries, periodontal status, chronic diseases, and some demographic characteristics. A group of 733 low‐income elders (mean age 72.7 ISD=4.71, 55.6% women, 55.1% members of ethnic minority groups in the U.S. and Canada) enrolled in the TEETH clinical trial were interviewed and examined as part of their fifth annual visit for the trial. OHQOL was measured by the Geriatric Oral Health Assessment Index (GOHAI); oral health and occlusal status by clinical exams and the Eichner Index; and demographics via interviews. Elders who completed the four‐year assessment had an average of 21.5 teeth (SD=6.9). with 8.5 occluding pairs (SD=4.6), and 32% with occlusal contacts in all four occluding zones. Stepwise multiple regressions were conducted to predict total GOHAI and its subscores (Physical, Social, and Worry). Functional dentition was a less significant predictor than ethnicity and being foreign‐bom. These variables, together with gender, years since immigrating, number of carious roots, and periodontal status, could predict 32% of the variance in total GOHAI, 24% in Physical, 27% in Social, and 21 % in the Worry subscales. These findings suggest that functional dentition and caries influence older adults' OHQOL, but that ethnicity and immigrant status play a larger role.  相似文献   
26.
27.
28.
29.
30.
Between 1954 and 1986 inclusive, 160 children in the North West Region of England were registered with histologically proven lowgrade astrocytomas (grade 1 or 2). Ten died before receiving any treatment, and a further seven died within 28 days of surgery, leaving 143 children whose survival in relation to treatment modality is the subject of this paper. Low-grade astrocytomas are responsive to radiation therapy. This treatment has no clear benefit to offer children with superficial tumours that can be resected completely or nearly so, but significantly improves survival rates when tumours are deep-seated and not amenable to excision.  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