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   184488篇
  免费   32717篇
  国内免费   2528篇
耳鼻咽喉   5404篇
儿科学   5886篇
妇产科学   2800篇
基础医学   7572篇
口腔科学   2499篇
临床医学   28927篇
内科学   55802篇
皮肤病学   8189篇
神经病学   17091篇
特种医学   7664篇
外科学   46539篇
综合类   372篇
现状与发展   72篇
一般理论   1篇
预防医学   8132篇
眼科学   3948篇
药学   3249篇
中国医学   76篇
肿瘤学   15510篇
  2024年   702篇
  2023年   4933篇
  2022年   1562篇
  2021年   3715篇
  2020年   6326篇
  2019年   2583篇
  2018年   7942篇
  2017年   7770篇
  2016年   8944篇
  2015年   8939篇
  2014年   16202篇
  2013年   16446篇
  2012年   6862篇
  2011年   7039篇
  2010年   11150篇
  2009年   14968篇
  2008年   7161篇
  2007年   5515篇
  2006年   8000篇
  2005年   5307篇
  2004年   4456篇
  2003年   3515篇
  2002年   3629篇
  2001年   5205篇
  2000年   4442篇
  1999年   4441篇
  1998年   4096篇
  1997年   3786篇
  1996年   3657篇
  1995年   3461篇
  1994年   2169篇
  1993年   1789篇
  1992年   2275篇
  1991年   2200篇
  1990年   1766篇
  1989年   1902篇
  1988年   1680篇
  1987年   1529篇
  1986年   1484篇
  1985年   1279篇
  1984年   909篇
  1983年   822篇
  1982年   668篇
  1981年   536篇
  1980年   478篇
  1979年   548篇
  1978年   509篇
  1977年   548篇
  1975年   429篇
  1972年   448篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
81.
BACKGROUND: Several clinical scoring systems have been used to evaluate the efficacy of botulinum toxin A in the treatment of hyperkinetic wrinkles. So far very few have been investigated for their reproducibility. OBJECTIVE: The aim of this study was to investigate the reproducibility of two clinical four-point scales for lateral canthal lines (crow's feet), at rest and at maximum smile. MATERIAL AND METHODS: Based on standardized photographs, a consensus atlas depicting the different severity grades [from 0 (none) to 3 (severe)] was developed. After training based on the atlas, 49 photographs at rest and 48 at maximum smile were graded by the same group of investigators on 2 consecutive days (n=9 on Day 1; n=8 on Day 2). The scores were compared for reproducibility using kappa statistics. RESULTS: Overall, reproducibility was good for both scales. Interobserver reproducibility showed an agreement of 0.6 at rest and 0.58 at maximum smile (unweighted kappa). Intraobserver reproducibility showed an agreement between 0.47 and 0.86 at rest and between 0.62 and 0.81 at maximum smile (unweighted kappa). Using weighted kappa analysis, the agreement ranged between 0.63 and 0.91 at rest and between 0.71 and 0.85 at maximum smile. CONCLUSION: The clinical scales using scores of 0 to 3 for crow's feet, both at rest and at maximum smile, show a good inter- and intraobserver reproducibility. The use of these scores in clinical trials can be recommended.  相似文献   
82.
83.
84.
85.
86.
87.
88.
89.
As the proportion of racial, ethnic, and cultural minorities in the United States continues to expand, pediatric emergency medicine providers are increasingly likely to encounter cultural and language barriers in practice. This paper reviews a conceptual framework encompassing the decision to seek emergency care, the process of providing such care, and the adherence to treatment plans and follow-up. The ways in which cultural and language barriers can negatively impact each element of this model are discussed in detail. Specific examples include provider ignorance of dangerous folk beliefs, communication barriers secondary to inappropriate interpreter use, and discriminatory assumptions regarding child abuse, pain management, and sexual activity. The practitioner is then provided with concrete recommendations to reduce these negative effects.  相似文献   
90.
Acute myelogenous leukemia (AMU is a hematologic disorder that is characterized by an abnormal proliferation of immature myeloid cells. Granulocytic sarcomas are clusters of leukemic myeloid cells that may develop as a result of AML. Oral manifestations of AML are common and often involve enlargements of the gingiva and/or mucosal tissue from direct leukemia cell infiltration. We describe the case history of a 50-year-old man who had an ulcera-tive lesion of the oral mucosa that was determined to be a granulocytic sarcoma of AML-M0 subtype. The combination of both the subtype and clinical presentation of the leukemia makes this presentation unusual, and to the best of our knowledge, of a type that has not been previously reported in the literature.  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