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   150583篇
  免费   31257篇
  国内免费   2394篇
耳鼻咽喉   5159篇
儿科学   5362篇
妇产科学   2398篇
基础医学   3079篇
口腔科学   1492篇
临床医学   26739篇
内科学   47065篇
皮肤病学   7421篇
神经病学   14808篇
特种医学   6346篇
外科学   40932篇
综合类   243篇
现状与发展   72篇
一般理论   5篇
预防医学   7102篇
眼科学   3348篇
药学   965篇
中国医学   6篇
肿瘤学   11692篇
  2024年   685篇
  2023年   4782篇
  2022年   1177篇
  2021年   3057篇
  2020年   6006篇
  2019年   2130篇
  2018年   7354篇
  2017年   7321篇
  2016年   8386篇
  2015年   8374篇
  2014年   15441篇
  2013年   15558篇
  2012年   5383篇
  2011年   5390篇
  2010年   10289篇
  2009年   14196篇
  2008年   5722篇
  2007年   3956篇
  2006年   6424篇
  2005年   3699篇
  2004年   2989篇
  2003年   1959篇
  2002年   2052篇
  2001年   3836篇
  2000年   3061篇
  1999年   3236篇
  1998年   3653篇
  1997年   3472篇
  1996年   3366篇
  1995年   3218篇
  1994年   1948篇
  1993年   1574篇
  1992年   1417篇
  1991年   1446篇
  1990年   1085篇
  1989年   1211篇
  1988年   1039篇
  1987年   885篇
  1986年   922篇
  1985年   750篇
  1984年   565篇
  1983年   532篇
  1982年   529篇
  1981年   409篇
  1980年   369篇
  1979年   319篇
  1978年   337篇
  1977年   410篇
  1975年   286篇
  1972年   314篇
排序方式: 共有10000条查询结果,搜索用时 15 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