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   31898篇
  免费   2742篇
  国内免费   1344篇
耳鼻咽喉   393篇
儿科学   587篇
妇产科学   576篇
基础医学   3904篇
口腔科学   544篇
临床医学   3417篇
内科学   5272篇
皮肤病学   741篇
神经病学   2138篇
特种医学   1046篇
外国民族医学   13篇
外科学   4082篇
综合类   4072篇
现状与发展   4篇
一般理论   19篇
预防医学   1877篇
眼科学   1146篇
药学   2572篇
  18篇
中国医学   1118篇
肿瘤学   2445篇
  2024年   52篇
  2023年   397篇
  2022年   791篇
  2021年   1396篇
  2020年   1040篇
  2019年   981篇
  2018年   1099篇
  2017年   967篇
  2016年   972篇
  2015年   1264篇
  2014年   1556篇
  2013年   1496篇
  2012年   2326篇
  2011年   2358篇
  2010年   1336篇
  2009年   1131篇
  2008年   1663篇
  2007年   1688篇
  2006年   1656篇
  2005年   1663篇
  2004年   1211篇
  2003年   1037篇
  2002年   926篇
  2001年   788篇
  2000年   796篇
  1999年   769篇
  1998年   430篇
  1997年   363篇
  1996年   279篇
  1995年   298篇
  1994年   234篇
  1993年   168篇
  1992年   303篇
  1991年   287篇
  1990年   276篇
  1989年   251篇
  1988年   217篇
  1987年   201篇
  1986年   197篇
  1985年   150篇
  1984年   106篇
  1983年   71篇
  1982年   49篇
  1981年   53篇
  1979年   73篇
  1978年   51篇
  1977年   52篇
  1974年   65篇
  1973年   60篇
  1972年   63篇
排序方式: 共有10000条查询结果,搜索用时 171 毫秒
971.
Congenital heart disease patients, specifically with unbalanced atrioventricular septal defects and common atrioventricular valves requiring single ventricle palliation, have substantial morbidity and mortality. Atrioventricular valve regurgitation (AVVR) is associated with poor outcomes in single ventricle patients, and many of them require surgical treatment of AVVR in their lifetimes. We describe a unique case of transcatheter edge‐to‐edge valve repair using the MitraClip system (Abbott, Chicago, IL) in a single ventricle patient with severe common AVVR.  相似文献   
972.
探讨奥美定隆乳注射患者术后取出的手术方式。对我科收治的奥美定注射患者,根据其临床表现、B超和MRI检查分成包膜硬结型、散在团块型、液态游走型及混合型,对不同类型的患者采取不同的手术方式。比较其愈合时间、术后并发症及复发情况。乳腔镜手术在伤口愈合时间上显著短于乳晕切口包块取出术。液态游走型或混合型患者行乳腔镜下包块取出术,术后伤口感染、疾病复发率显著高于乳腺切除组。包膜硬结型、散在团块型可行乳腔镜包块取出术、乳晕切口包块取出术或乳腺部分切除术,以尽量保留乳腺的完整,液态游走型或混合型应行乳腺全切术以彻底根治。  相似文献   
973.
The present article reports a case involving an immunocompetent, previously well child who, despite two previous doses of inactivated poliovirus vaccine, developed severe flaccid paralysis consistent with polio after receiving oral polio vaccine.  相似文献   
974.
975.
This paper reports the development and psychometric evaluations of a multidimensional model of loneliness in Australian adolescents. In the first study a new instrument was designed and administered to 1,074 adolescents (ages 10–18 years, M = 13.01). An exploratory factor analysis from data supplied by 694 of these participants yielded a 4-factor structure (friendship, isolation, negative attitude to solitude, and positive attitude to solitude). Competing measurement models were then evaluated using confirmatory factor analysis with data from the remaining 380 participants; strong support was demonstrated for the conceptual model. Significant main effects were evident for geographical location (rural remote/urban), age and sex. In a second study, involving 235 Australian adolescents (ages 10.0–16 years, M = 13.8) the superiority of the first-order model represented by four correlated factors was confirmed. The findings have clinical and practical implications for professional groups represented by child and adolescent psychiatry, pediatric and clinical psychology services, researchers, and educators. Specifically, the new self-report instrument identifies adolescents who are at risk of loneliness and its associated adverse outcomes and in doing has the potential to offer new insights into prevention and intervention.  相似文献   
976.
Is epilepsy truly an “African ailment”? We aimed to determine this, since international health agencies often refer to epilepsy as an African disease and the scientific literature has spoken the same tone. Various published materials, mainly reports, articles, were used to gather Asian and African evidence on various aspects of epilepsy and many of its risk and associated factors. Our results suggest that in no way can epilepsy be considered as an African ailment and such characterization is most likely based on popular beliefs rather than scientific evidence. In comparison to Africa, Asia has a 5.0% greater burden from all diseases, and is 17.0% more affected from neuropsychiatric disorders (that include epilepsy). Given that more countries in Asia are transitioning, there may be large demographic and lifestyle changes in the near future. However these changes are nowhere close to those expected in Africa. Moreover, 23 million Asians have epilepsy in comparison to 3.3 million Africans and 1.2 million sub‐Saharan Africans. In comparison to Africa, Asia has more untreated patients, 55.0% more additional epilepsy cases every year, because of its larger population, with greater treatment cost and possibly higher premature mortality. Of several associated factors discussed herein, many have more importance for Asia than Africa. The current state of epilepsy in Asia is far less than ideal and there is an urgent need to recognize and accept the importance of epilepsy in Asia. In no way can epilepsy be considered as an African ailment. This is most likely based on popular beliefs rather than scientific evidence. A PowerPoint slide summarizing this article is available for download in the Supporting Information section here .  相似文献   
977.

Background

Ischemic stroke (IS) and coronary heart disease (CHD) are two vascular disorders that are a common cause of death worldwide. Several studies have assessed the association of the β-fibrinogen-455G/A (FGB-455G/A) polymorphism and risk of IS and CHD, but the results are still inconsistent. Our study aimed to investigate whether the FGB-455G/A polymorphism was associated with susceptibility to IS and CHD by using meta-analysis.

Methods

Relevant studies were identified from PubMed, Embase and four Chinese database up to July 2013.Data were analyzed and processed by Stata 11.2. A pooled OR with 95% CI was calculated to estimate the strength of the genetic association. Cumulative meta-analysis was performed to assess the tendency of pooled OR over time.

Results

45 studies based on a total of 7238 cases and 7395 controls were included in our meta-analysis. The results indicated that the FGB-455G/A polymorphism is associated with the risk of IS when compared with the dominant model (OR = 1.518, 95%CI = 1.279-1.802 for AA + GA vs. GG). In the subgroup analysis by ethnicity, significantly elevated risks were associated with the A allele in Asians (OR = 1.700, 95%CI = 1.417-2.040), but not in Caucasians (OR = 0.942, 95%CI = 0.813-1.091). Both the hypertension and non-hypertension subgroups reached significant results, but no significance was found when stratified according to sex or subtype of IS. Results indicate that the FGB-455G/A polymorphism is associated with CHD (OR = 1.802, 95%CI = 1.445-2.246).

Conclusion

Our meta-analysis suggests that the FGB-455G/A polymorphism contributes to susceptibility to IS and CHD.  相似文献   
978.
Tan AH  Low SY  Al Jajeh I 《Chest》2012,141(3):809-813
  相似文献   
979.
980.
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