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   1356篇
  免费   51篇
  国内免费   11篇
耳鼻咽喉   81篇
儿科学   67篇
妇产科学   6篇
基础医学   159篇
口腔科学   33篇
临床医学   94篇
内科学   274篇
皮肤病学   23篇
神经病学   46篇
特种医学   41篇
外科学   177篇
综合类   20篇
预防医学   38篇
眼科学   121篇
药学   88篇
中国医学   6篇
肿瘤学   144篇
  2024年   3篇
  2023年   9篇
  2022年   41篇
  2021年   42篇
  2020年   24篇
  2019年   25篇
  2018年   26篇
  2017年   27篇
  2016年   35篇
  2015年   39篇
  2014年   62篇
  2013年   67篇
  2012年   97篇
  2011年   95篇
  2010年   66篇
  2009年   43篇
  2008年   90篇
  2007年   76篇
  2006年   95篇
  2005年   69篇
  2004年   55篇
  2003年   56篇
  2002年   69篇
  2001年   18篇
  2000年   19篇
  1999年   18篇
  1998年   18篇
  1997年   25篇
  1996年   11篇
  1995年   7篇
  1994年   18篇
  1993年   7篇
  1992年   11篇
  1991年   3篇
  1990年   5篇
  1989年   5篇
  1988年   7篇
  1987年   4篇
  1986年   2篇
  1982年   3篇
  1981年   4篇
  1980年   3篇
  1979年   1篇
  1978年   6篇
  1977年   1篇
  1976年   1篇
  1975年   4篇
  1974年   2篇
  1971年   1篇
  1968年   1篇
排序方式: 共有1418条查询结果,搜索用时 15 毫秒
21.
22.
23.
PURPOSE: To investigate clinical, anatomic, and electrophysiologic response after single intravitreal injection of bevacizumab for macular edema attributable to retinal vein occlusion. DESIGN: Prospective nonrandomized, interventional case series. METHODS: Twenty-one patients with macular edema attributable to vein occlusion received intravitreal injection of bevacizumab 1.25 mg. Nine patients had central retinal vein occlusion (CRVO), and 12 patients had branch retinal vein occlusion (BRVO). Complete ophthalmic examination including optical coherence tomography (OCT) was done at baseline and follow-up visits. Fifteen patients underwent fluorescein angiography at baseline. Selected patients underwent electroretinography (ERG) and visual evoked potential (VEP) at baseline and follow-up. Follow-up was for 12 weeks. RESULTS: At baseline, mean visual acuity was 20/381 (median, 20/400) and showed improvement to mean 20/135 (median, 20/60) after one month, (P = .001). At 12 weeks, mean visual acuity was 20/178 (median, 20/80) (P = .001). The mean central retinal thickness (CRT) was 647.81 microm (median, 609.00 microm) at baseline and decreased to mean 293.43 microm (median, 222.00 microm) at one month (P = .001). At 12 weeks, mean CRT was 320.90 mum (median, 280.00 microm) (P = .001). ERG and VEP showed no worsening of the waveforms. There was no significant difference in the visual outcome between the BRVO and CRVO groups. CONCLUSION: Intravitreal injection of bevacizumab appears to result in significant short-term improvement of visual acuity and macular edema secondary to vein occlusion. The present report confirms the previous studies. No ocular toxicity or adverse effects were observed. However, prospective, randomized, controlled long-term studies are required with an adequate number of patients.  相似文献   
24.
25.

Background

Pregnancy-related vital registration is important to inform policy to reduce maternal, fetal and newborn mortality, yet few systems for capturing accurate data are available in low-middle income countries where the majority of the mortality occurs. Furthermore, methods to effectively implement high-quality registration systems have not been described. The goal of creating the registry described in this paper was to inform public health policy makers about pregnancy outcomes in our district so that appropriate interventions to improve these outcomes could be undertaken and to position the district to be a leader in pregnancy-related public health research.

Methods

We created a prospective maternal and newborn health registry in Belgaum, Karnataka State, India. To initiate this registry, we worked with the Ministry of Health to first establish estimated birth rates and define the catchment areas of the clusters, working within the existing health system and primary health centers. We also undertook household surveys to identify women likely to become pregnant. We then implemented monitoring measures to ensure high quality and completeness of the maternal newborn health registry. All pregnant women in the catchment area were identified, consented and enrolled during pregnancy, with follow-up visits to ascertain pregnancy outcomes and mother/infant status at 42-days postpartum.

Results

From 2008 through 2014, we demonstrated continued improvements in both the coverage for enrollment and accuracy of reporting pregnancy outcomes within the defined catchment area in Belgaum, India. Nearly 100% of women enrolled had follow-up at birth and 99% had 42-day follow-up. Furthermore, we facilitated earlier enrollment of women during pregnancy while achieving more timely follow-up and decreased time of reporting from the date of the pregnancy event.

Conclusions

We created a pregnancy-related registry which includes demographic data, risk factors, and outcomes allowing for high rates of ascertainment and follow-up while working within the existing health system. Understanding the elements of the system used to create the registry is important to improve the quality of the results. Tracking of pregnancies and their outcomes is an important step toward reducing maternal and perinatal mortality.
  相似文献   
26.
27.
International Ophthalmology - To evaluate the frequency and outcomes of acute-onset endophthalmitis following combined pars plana vitrectomy and scleral fixation of intraocular lens. We evaluated...  相似文献   
28.
29.
30.
Traumatic vertebral artery injuries may be due to blunt or penetrating forces, the presentation of which can vary from being asymptomatic to a life threatening torrential bleed. The following case report describes an isolated vertebral artery injury with a rare mode of injury and presentation along with its management.  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