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   94225篇
  免费   6796篇
  国内免费   263篇
耳鼻咽喉   1059篇
儿科学   2720篇
妇产科学   2208篇
基础医学   14609篇
口腔科学   2565篇
临床医学   9147篇
内科学   18640篇
皮肤病学   1366篇
神经病学   9207篇
特种医学   3749篇
外国民族医学   51篇
外科学   12645篇
综合类   894篇
一般理论   133篇
预防医学   7201篇
眼科学   2318篇
药学   6832篇
中国医学   213篇
肿瘤学   5727篇
  2022年   546篇
  2021年   1437篇
  2020年   910篇
  2019年   1344篇
  2018年   1642篇
  2017年   1209篇
  2016年   1387篇
  2015年   1606篇
  2014年   2068篇
  2013年   3550篇
  2012年   4864篇
  2011年   5140篇
  2010年   3338篇
  2009年   2939篇
  2008年   4771篇
  2007年   5172篇
  2006年   5067篇
  2005年   4944篇
  2004年   4890篇
  2003年   4627篇
  2002年   4607篇
  2001年   2420篇
  2000年   2414篇
  1999年   2254篇
  1998年   1321篇
  1997年   1133篇
  1996年   947篇
  1995年   986篇
  1994年   862篇
  1993年   909篇
  1992年   1664篇
  1991年   1586篇
  1990年   1511篇
  1989年   1464篇
  1988年   1250篇
  1987年   1240篇
  1986年   1217篇
  1985年   1131篇
  1984年   977篇
  1983年   909篇
  1982年   789篇
  1981年   742篇
  1980年   691篇
  1979年   779篇
  1978年   561篇
  1977年   552篇
  1976年   417篇
  1975年   504篇
  1974年   524篇
  1973年   430篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
1.
2.
3.
4.
5.
6.
7.
8.

Background

Current blunt cerebrovascular injury (BCVI) grading grossly differentiates injury characteristics such as luminal stenosis (LS) and aneurysmal disease. The effect of increasing degree of LS beyond the current BCVI grading scale on stroke formation is unknown.

Study Design

BCVI over a 3-year period were retrospectively reviewed. To investigate influence of LS beyond the BCVI grading scale within aneurysmal and non-aneurysmal BCVI, grade 2 BCVI were subdivided into BCVI with ≥ 25% and ≤ 50% LS and BCVI with > 50% and ≤ 99% LS. Grade 3 BCVI were subdivided into BCVI with pseudoaneurysm (PSA) without LS and BCVI with PSA and LS. We hypothesized increased LS beyond the current BCVI grade distinctions would be associated with higher rates of stroke formation.

Results

312 BCVI were included, of which 140 were carotid BCVI and 172 vertebral BCVI. Sixteen carotid BCVI underwent endovascular intervention (EI) and 19 suffered a stroke. In carotid BCVI stroke rates increased sequentially with BCVI grade except in grade 3. There was a stroke rate of 12% in grade 1 carotid BCVI, 18% in grade 2, 6% in grade 3, and 31% in grade 4. In subgroup analysis for grade 2 carotid BCVI, BCVI with > 50% and ≤ 99% LS had higher rates of stroke (22% vs. 15%, p?=?0.44) than BCVI with ≥ 25% and ≤ 50% LS. In subgroup analysis of grade 3 carotid BCVI, BCVI with PSA and LS had higher rates of stroke (9% vs. 4%, p?=?0.48) than BCVI with PSA without LS. Higher rates of EI in grade 2 carotid BCVI with > 50% and ≤ 99% LS (22% vs. 5%, p?=?0.14) and grade 3 carotid BCVI with PSA and LS (35% vs. 4%, p?=?0.01) were noted in subgroup analysis.

Conclusion

Higher percentage LS beyond the currently used BCVI grading scale has a non-significantly increased rate of stroke in both aneurysmal and non-aneurysmal BCVI. Grade 3 BCVI with PSA and LS seems to be a high-risk subgroup. Use of EI confounds modern measurement of stroke risk in higher LS BCVI.  相似文献   
9.
Clinical Oral Investigations - The aim of this study was the analysis of WNT10A variants in seven families of probands with various forms of tooth agenesis and self-reported family history of...  相似文献   
10.
The aim of this study was to analyse the effect of body mass index (BMI), both low and high values, on the perioperative complication rate in patients with oral squamous cell carcinoma (OSCC). The medical records of 259 patients operated between 2014 and 2017 for OSCC were reviewed. Univariate and multivariate analyses were performed. Sixty of the 259 patients developed 87 complications. Low or high BMI was not associated with the perioperative complication rate. A longer operating time and increased blood loss were associated with a higher perioperative complication rate and higher Clavien–Dindo grade. Low BMI, American Society of Anesthesiologists score 2 and 3, a longer operating time, and increased blood loss were associated with a longer hospital stay. Low BMI was associated with a longer hospital stay. Neither low nor high BMI was associated with the perioperative complication rate. A longer operating time and increased blood loss were associated with a higher perioperative complication rate and higher Clavien–Dindo grade.  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