全文获取类型
收费全文 | 94225篇 |
免费 | 6796篇 |
国内免费 | 263篇 |
专业分类
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 |
出版年
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.
Factors predicting the development of pressure ulcers in an at‐risk population who receive standardized preventive care: secondary analyses of a multicentre randomised controlled trial
下载免费PDF全文
![点击此处可从《Journal of advanced nursing》网站下载免费的PDF全文](/ch/ext_images/free.gif)
6.
7.
8.
Margaret H. Lauerman Karen Irizarry Clint Sliker Brandon R. Bruns Ronald Tesoriero Thomas M. Scalea Deborah M. Stein 《Injury》2019,50(1):131-136
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.
Bielik Peter Bonczek Ondřej Krejčí Přemysl Zeman Tomáš Izakovičová-Hollá Lydie Šoukalová Jana Vaněk Jiří Vojtěšek Bořivoj Lochman Jan Balcar Vladimir J. Šerý Omar 《Clinical oral investigations》2022,26(12):7045-7055
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.
W. Do T. Elzerman R. de Bree A. Rosenberg T. Forouzanfar E.M. Van Cann 《International journal of oral and maxillofacial surgery》2021,50(5):591-597
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