全文获取类型
收费全文 | 239922篇 |
免费 | 20512篇 |
国内免费 | 2138篇 |
专业分类
耳鼻咽喉 | 1862篇 |
儿科学 | 7058篇 |
妇产科学 | 8295篇 |
基础医学 | 19779篇 |
口腔科学 | 3180篇 |
临床医学 | 14838篇 |
内科学 | 29874篇 |
皮肤病学 | 2509篇 |
神经病学 | 4300篇 |
特种医学 | 12233篇 |
外国民族医学 | 219篇 |
外科学 | 27918篇 |
综合类 | 7659篇 |
现状与发展 | 16篇 |
一般理论 | 14篇 |
预防医学 | 5208篇 |
眼科学 | 1493篇 |
药学 | 8396篇 |
55篇 | |
中国医学 | 1073篇 |
肿瘤学 | 106593篇 |
出版年
2024年 | 114篇 |
2023年 | 6541篇 |
2022年 | 9180篇 |
2021年 | 12165篇 |
2020年 | 12115篇 |
2019年 | 9041篇 |
2018年 | 10613篇 |
2017年 | 9497篇 |
2016年 | 9036篇 |
2015年 | 10345篇 |
2014年 | 17855篇 |
2013年 | 16295篇 |
2012年 | 14914篇 |
2011年 | 14197篇 |
2010年 | 13236篇 |
2009年 | 11361篇 |
2008年 | 9315篇 |
2007年 | 9437篇 |
2006年 | 8552篇 |
2005年 | 7771篇 |
2004年 | 6806篇 |
2003年 | 6250篇 |
2002年 | 5613篇 |
2001年 | 5264篇 |
2000年 | 4521篇 |
1999年 | 4050篇 |
1998年 | 2157篇 |
1997年 | 1747篇 |
1996年 | 1689篇 |
1995年 | 965篇 |
1994年 | 799篇 |
1993年 | 695篇 |
1992年 | 1771篇 |
1991年 | 1562篇 |
1990年 | 1456篇 |
1989年 | 1332篇 |
1988年 | 1026篇 |
1987年 | 580篇 |
1986年 | 243篇 |
1985年 | 417篇 |
1984年 | 413篇 |
1983年 | 292篇 |
1982年 | 281篇 |
1981年 | 217篇 |
1980年 | 222篇 |
1979年 | 183篇 |
1978年 | 105篇 |
1977年 | 71篇 |
1976年 | 71篇 |
1974年 | 41篇 |
排序方式: 共有10000条查询结果,搜索用时 359 毫秒
1.
2.
《Cancer radiothérapie》2022,26(4):611-615
In order to provide more convenient irradiation regimens for patient comfort, radiation facility organization and health expenses, new hypofractionated protocols have been evaluated. Moderately (dose/fraction: 2.3 to 3 Gy), then ultra (dose/fraction: 5.2 to 6.1 Gy) hypofractionated irradiations were first validated. The current question is: is it possible to go forward using extreme hypofractionated regimens (EHR) based on 1 to 3 fractions. Different irradiation techniques are under investigation. However, brachytherapy remains the smartest way to deliver a high dose in a small volume. We report prospective and retrospective study results which evaluated EHR for breast and prostate brachytherapy. While oncological outcome and toxicity profile appear extremely encouraging for low-risk breast cancer after a 1 to 4 fractions (6.25 to 20 Gy/fraction), the use of a single fraction of 19 to 23 Gy appears debatable for prostate cancer. Brachytherapy represents an emblematic example of EHR but longer follow-up and more mature results are awaited in order to specify the right indications and refine the EQD2 calculation method including new biological and technical factors. 相似文献
3.
4.
5.
《International journal of oral and maxillofacial surgery》2022,51(3):332-337
The purpose of this study was to investigate the association between habitual snoring (HS), middle ear disease (MED), and speech problems in children with cleft palate. This cross-sectional study included children aged 2.0–7.9 years with non-syndromic cleft palate anomalies. Parents completed the Pediatric Sleep Questionnaire and a questionnaire about MED. Audiograms and speech assessment were also conducted. Ninety-five children were enrolled; 15.2% of families reported HS, 97.6% MED, and 17.1% speech problems. HS (37.5% vs 10.3%, P = 0.007) and early episodes of MED (92.3% vs 58.2%, P = 0.021) were more likely to be reported for children with isolated cleft palate when compared to those with cleft lip and palate. Children with cleft lip and palate had a higher frequency of MED with effusion compared to those with Robin sequence (86.4% vs 57.1%, P = 0.049). The odds ratio for HS in children with ≥1 episode of MED in the last year was 7.37 (95% confidence interval 1.55–35.15, P = 0.012). There was a trend for children with speech problems reported by parents to have HS (30.8% vs 11.5%, P= 0.076). Anatomical factors play a role in the frequency of upper airway symptoms in children with cleft palate. A recent history of at least one episode of MED was associated with an increased frequency of HS. 相似文献
6.
7.
8.
9.
10.
BackgroundTo investigate perioperative complication rates at radical nephrectomy (RN) according to inferior vena cava thrombectomy (IVC-T) status and stage (metastatic vs non-metastatic) within kidney cancer patients.Materials and methodsWe ascertained perioperative complication rates within the National Inpatient Sample database (2016–2019). First, log-link linear Generalized Estimating Equation function (GEE) regression models (adjusted for hospital clustering and weighted for discharge disposition) tested complication rates in IVC-T patients, according to metastatic stage. Subsequently, a subgroup analysis relied on RN patients with or without IVC-T. Here, multivariable logistic regression models tested complication rates in RN patients according to IVC-T status, after propensity score matching including metastatic stage.ResultsOf 26,299 RN patients, 461 (2%) patients underwent IVC-T. Of those, 252 (55%) were non-metastatic vs 209 (45%) were metastatic. Rates of acute kidney injury (AKI), transfusion, cardiac, thromboembolic and other medical complications in non-metastatic vs metastatic patients were 40 vs 40%, 25 vs 22%, 21 vs 23%, 19 vs 14% and 38 vs 40%, respectively (all p ≥ 0.2). Metastatic stage in IVC-T patients did not predict differences in complications in log-link linear GEE regression models (all p > 0.1). However, in logistic regression models with propensity score matching, relying on the overall cohort of RN patients, IVC-T status was associated with higher complication rates (all p < 0.001): AKI (Odds ratio [OR]:2.60; 95%-CI [95%-Confidence interval: 1.97–3.44), transfusions (OR:2.40; 95%-CI: 1.72–3.36), cardiac (OR:2.27; 95%-CI: 1.49–3.47), thromboembolic (OR:9.07; 95%-CI: 5.21–16.58) and other medical complications (OR:2.01; 95%-CI: 1.52–2.66).ConclusionsThe current analyses indicate that presence of concomitant IVC-T is associated with higher complication rate at RN. Conversely, metastatic stage has no effect on recorded complication rates. 相似文献