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   156625篇
  免费   31491篇
  国内免费   2446篇
耳鼻咽喉   5210篇
儿科学   5543篇
妇产科学   2555篇
基础医学   3976篇
口腔科学   1654篇
临床医学   27073篇
内科学   48562篇
皮肤病学   7581篇
神经病学   15513篇
特种医学   6682篇
外科学   41521篇
综合类   261篇
现状与发展   72篇
预防医学   7292篇
眼科学   3478篇
药学   1363篇
中国医学   44篇
肿瘤学   12182篇
  2024年   696篇
  2023年   4840篇
  2022年   1314篇
  2021年   3257篇
  2020年   6116篇
  2019年   2297篇
  2018年   7552篇
  2017年   7461篇
  2016年   8547篇
  2015年   8575篇
  2014年   15669篇
  2013年   15840篇
  2012年   5862篇
  2011年   5886篇
  2010年   10594篇
  2009年   14459篇
  2008年   6151篇
  2007年   4405篇
  2006年   6881篇
  2005年   4120篇
  2004年   3396篇
  2003年   2359篇
  2002年   2387篇
  2001年   3853篇
  2000年   3047篇
  1999年   3273篇
  1998年   3709篇
  1997年   3512篇
  1996年   3400篇
  1995年   3242篇
  1994年   1958篇
  1993年   1591篇
  1992年   1394篇
  1991年   1424篇
  1990年   1071篇
  1989年   1201篇
  1988年   1041篇
  1987年   867篇
  1986年   899篇
  1985年   721篇
  1984年   558篇
  1983年   533篇
  1982年   526篇
  1981年   407篇
  1980年   364篇
  1979年   319篇
  1978年   335篇
  1977年   405篇
  1975年   280篇
  1972年   304篇
排序方式: 共有10000条查询结果,搜索用时 62 毫秒
71.
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   
72.
73.
74.
75.
76.
77.
78.
79.
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   
80.
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