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   564691篇
  免费   69148篇
  国内免费   31415篇
耳鼻咽喉   8416篇
儿科学   10643篇
妇产科学   6890篇
基础医学   47678篇
口腔科学   8270篇
临床医学   84087篇
内科学   101406篇
皮肤病学   11757篇
神经病学   34225篇
特种医学   21711篇
外国民族医学   236篇
外科学   77833篇
综合类   80775篇
现状与发展   165篇
一般理论   34篇
预防医学   38345篇
眼科学   14851篇
药学   46523篇
  483篇
中国医学   27522篇
肿瘤学   43404篇
  2024年   2089篇
  2023年   10480篇
  2022年   17258篇
  2021年   23220篇
  2020年   21693篇
  2019年   14860篇
  2018年   20485篇
  2017年   20109篇
  2016年   20081篇
  2015年   26890篇
  2014年   38488篇
  2013年   36924篇
  2012年   37432篇
  2011年   41292篇
  2010年   34792篇
  2009年   34226篇
  2008年   30083篇
  2007年   27953篇
  2006年   29129篇
  2005年   25167篇
  2004年   17134篇
  2003年   15365篇
  2002年   12946篇
  2001年   13057篇
  2000年   11967篇
  1999年   12093篇
  1998年   9238篇
  1997年   8821篇
  1996年   7507篇
  1995年   7108篇
  1994年   5196篇
  1993年   3697篇
  1992年   3904篇
  1991年   3639篇
  1990年   2937篇
  1989年   2789篇
  1988年   2371篇
  1987年   2096篇
  1986年   1889篇
  1985年   1420篇
  1984年   942篇
  1983年   800篇
  1982年   665篇
  1981年   576篇
  1980年   478篇
  1979年   472篇
  1978年   409篇
  1977年   451篇
  1975年   308篇
  1972年   345篇
排序方式: 共有10000条查询结果,搜索用时 11 毫秒
11.
12.
13.
目的 探讨膀胱肿瘤并前列腺增生症患者同期施行膀胱肿瘤切除术和保留尿道粘膜前列腺切除术的可行性.方法 对同期施行经尿道膀胱肿瘤切除术及保留尿道粘膜前列腺切除术的16例膀胱癌合并前列腺增生症患者的临床资料进行了回顾性分析.结果 该组患者均顺利康复,无明显合并症,术后复诊,随访时间2~4年,3例出现肿瘤复发.结论 同期施行膀胱肿瘤切除术和保留尿道粘膜前列腺切除术,安全、效果肯定,值得基层医院推广应用.  相似文献   
14.
15.
16.
17.
CONTEXT: The physician assistant profession has been moving toward requiring master's degrees for new practitioners, but some argue this could change the face of the discipline. PURPOSE: To see if there is an association between physician assistants' academic degrees and practice in primary care, in rural areas, and with the medically underserved. METHODS: Surveys were sent to 880 graduates of the first 32 University of Washington physician assistant classes through 2000. Respondents noted their academic degree at program entry and the highest degree attained at any time up to the time of survey. Relationships between practice characteristics and academic degree levels were tested by unadjusted odds ratios and logistic regression after controlling for year of graduation and sex. RESULTS: Of the 478 respondents, 54% worked in primary care, about 30% practiced in nonmetropolitan communities, and 42% reported providing care for the medically underserved. Respondents with no degree (33% of total at entry, 24% at survey) were significantly more likely than degree holders to work in primary care and nonmetropolitan areas. Respondents with no degree at program entry were significantly more likely, and those with no degree at the time of the survey were marginally more likely, to self-report work with the medically underserved. CONCLUSION: Respondents with no academic degree are significantly more likely to demonstrate a commitment to primary, rural, and underserved health care. These findings may inform the national debate about the impact of required advanced degrees on the practice patterns of nonphysician providers.  相似文献   
18.
19.
The objective of this study is to assess the efficacy and safety of herbal medicines (HMs), as a monotherapy or adjunct therapy, compared to placebo or conventional approaches in the treatment of idiopathic Parkinson's disease (PD). We conducted a systematic review of randomized controlled trials from both conventional and alternative medicine sources. Outcome measures were overall improvement, quality of life, reduction of levodopa dose, and adverse events. Nine studies were included, each testing a different HM. Six of the trials had limited internal validity due to major flaws in design, including the lack of proper randomization; insufficient blinding; unclear inclusive criteria in terms of diagnostic criteria, baseline staging, and duration of disease; lack of proper sample size calculation; and insufficient data analysis. Imbalances in gender and ethnicity among the patients in the included trials were observed. No major adverse events emerged, and no specific pattern was detected from the trials describing such data. In addition to major methodological defects, heterogeneity in (1) HM tested, (2) control treatment, and (3) outcome measure hindered in-depth data analysis and synthesis. Current evidence is insufficient to evaluate the efficacy and safety of various HMs. Further studies with improved trial design and reporting, with assessment on cost-effectiveness, quality of life, and qualitative data are warranted.  相似文献   
20.
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