全文获取类型
收费全文 | 94427篇 |
免费 | 4081篇 |
国内免费 | 267篇 |
专业分类
耳鼻咽喉 | 1150篇 |
儿科学 | 1985篇 |
妇产科学 | 2680篇 |
基础医学 | 8261篇 |
口腔科学 | 2688篇 |
临床医学 | 9484篇 |
内科学 | 20050篇 |
皮肤病学 | 2081篇 |
神经病学 | 8265篇 |
特种医学 | 4988篇 |
外国民族医学 | 2篇 |
外科学 | 20353篇 |
综合类 | 896篇 |
现状与发展 | 1篇 |
一般理论 | 16篇 |
预防医学 | 3420篇 |
眼科学 | 2412篇 |
药学 | 2406篇 |
5篇 | |
中国医学 | 195篇 |
肿瘤学 | 7437篇 |
出版年
2023年 | 4742篇 |
2022年 | 6746篇 |
2021年 | 6949篇 |
2020年 | 8071篇 |
2019年 | 4630篇 |
2018年 | 3935篇 |
2017年 | 3970篇 |
2016年 | 3971篇 |
2015年 | 3255篇 |
2014年 | 7788篇 |
2013年 | 5369篇 |
2012年 | 3333篇 |
2011年 | 2661篇 |
2010年 | 4415篇 |
2009年 | 4164篇 |
2008年 | 2078篇 |
2007年 | 2077篇 |
2006年 | 1885篇 |
2005年 | 1458篇 |
2004年 | 1229篇 |
2003年 | 1332篇 |
2002年 | 1229篇 |
2001年 | 1168篇 |
2000年 | 1066篇 |
1999年 | 1206篇 |
1998年 | 809篇 |
1997年 | 667篇 |
1996年 | 708篇 |
1995年 | 638篇 |
1994年 | 486篇 |
1993年 | 393篇 |
1992年 | 528篇 |
1991年 | 507篇 |
1990年 | 501篇 |
1989年 | 484篇 |
1988年 | 512篇 |
1987年 | 366篇 |
1986年 | 196篇 |
1985年 | 271篇 |
1984年 | 275篇 |
1983年 | 206篇 |
1982年 | 210篇 |
1981年 | 183篇 |
1980年 | 162篇 |
1979年 | 183篇 |
1978年 | 154篇 |
1977年 | 104篇 |
1976年 | 120篇 |
1975年 | 104篇 |
1974年 | 97篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
11.
《European journal of surgical oncology》2022,48(3):621-631
ObjectivesThe aim of this meta-analysis was to conduct a contemporary systematic review of high quality non-randomised controlled trials to determine the effect of pre-liver transplantation (LT) transarterial chemoembolisation (TACE) on long-term survival and complications of hepatocellular carcinoma (HCC) patients.BackgroundTACE is used as a neoadjuvant therapy to mitigate waitlist drop-out for patients with HCC awaiting LT. Previous studies have conflicting conclusions on the effect of TACE on long-term survival and complications of HCC patients undergoing LT.MethodsCINAHL, Cochrane Controlled Register of Trials, Embase, PubMed, and Web of Science were systematically searched. Baseline characteristics included number of patients outside Milan criteria, tumour diameter, MELD score, and time on the waiting list. Primary outcomes included 3- and 5-year overall and disease-free survival. Secondary outcomes included tumour recurrence, 30-day postoperative mortality, and hepatic artery and biliary complications.ResultsTwenty-one high-quality NRCTs representing 8242 patients were included. Tumour diameter was significantly larger in TACE patients (3.49 cm vs 3.15 cm, P = 0.02) and time on the waiting list was significantly longer in TACE patients (4.87 months vs 3.46 months, P = 0.05), while MELD score was significantly higher in non-TACE patients (10.81 vs 12.35, P = 0.005). All primary and secondary outcomes displayed non-significant differences.ConclusionPatients treated with TACE had similar survival and postoperative outcomes to non-TACE patients, however, they had worse prognostic features compared to non-TACE patients. These findings strongly support the current US and European clinical practice guidelines that neoadjuvant TACE can be used for patients with longer expected waiting list times (specifically >6 months). Randomised controlled trials would be needed to increase the quality of evidence. 相似文献
12.
13.
We present an automated approach to detect and longitudinally track skin lesions on 3D total-body skin surface scans. The acquired 3D mesh of the subject is unwrapped to a 2D texture image, where a trained objected detection model, Faster R-CNN, localizes the lesions within the 2D domain. These detected skin lesions are mapped back to the 3D surface of the subject and, for subjects imaged multiple times, we construct a graph-based matching procedure to longitudinally track lesions that considers the anatomical correspondences among pairs of meshes and the geodesic proximity of corresponding lesions and the inter-lesion geodesic distances.We evaluated the proposed approach using 3DBodyTex, a publicly available dataset composed of 3D scans imaging the coloured skin (textured meshes) of 200 human subjects. We manually annotated locations that appeared to the human eye to contain a pigmented skin lesion as well as tracked a subset of lesions occurring on the same subject imaged in different poses. Our results, when compared to three human annotators, suggest that the trained Faster R-CNN detects lesions at a similar performance level as the human annotators. Our lesion tracking algorithm achieves an average matching accuracy of 88% on a set of detected corresponding pairs of prominent lesions of subjects imaged in different poses, and an average longitudinal accuracy of 71% when encompassing additional errors due to lesion detection. As there currently is no other large-scale publicly available dataset of 3D total-body skin lesions, we publicly release over 25,000 3DBodyTex manual annotations, which we hope will further research on total-body skin lesion analysis. 相似文献
14.
15.
16.
17.
18.
19.
20.