全文获取类型
收费全文 | 50129篇 |
免费 | 2152篇 |
国内免费 | 526篇 |
专业分类
耳鼻咽喉 | 1214篇 |
儿科学 | 502篇 |
妇产科学 | 581篇 |
基础医学 | 2493篇 |
口腔科学 | 4932篇 |
临床医学 | 2011篇 |
内科学 | 1158篇 |
皮肤病学 | 2114篇 |
神经病学 | 751篇 |
特种医学 | 900篇 |
外国民族医学 | 3篇 |
外科学 | 30911篇 |
综合类 | 1623篇 |
现状与发展 | 1篇 |
一般理论 | 4篇 |
预防医学 | 424篇 |
眼科学 | 663篇 |
药学 | 596篇 |
6篇 | |
中国医学 | 39篇 |
肿瘤学 | 1881篇 |
出版年
2024年 | 62篇 |
2023年 | 1628篇 |
2022年 | 2705篇 |
2021年 | 2523篇 |
2020年 | 2986篇 |
2019年 | 1684篇 |
2018年 | 1667篇 |
2017年 | 1463篇 |
2016年 | 1582篇 |
2015年 | 1511篇 |
2014年 | 3443篇 |
2013年 | 3083篇 |
2012年 | 3095篇 |
2011年 | 2842篇 |
2010年 | 2605篇 |
2009年 | 2317篇 |
2008年 | 1925篇 |
2007年 | 1902篇 |
2006年 | 1707篇 |
2005年 | 1478篇 |
2004年 | 1248篇 |
2003年 | 1158篇 |
2002年 | 1044篇 |
2001年 | 972篇 |
2000年 | 890篇 |
1999年 | 860篇 |
1998年 | 454篇 |
1997年 | 379篇 |
1996年 | 284篇 |
1995年 | 244篇 |
1994年 | 221篇 |
1993年 | 138篇 |
1992年 | 409篇 |
1991年 | 377篇 |
1990年 | 394篇 |
1989年 | 351篇 |
1988年 | 311篇 |
1987年 | 148篇 |
1986年 | 76篇 |
1985年 | 71篇 |
1984年 | 75篇 |
1983年 | 58篇 |
1982年 | 56篇 |
1981年 | 52篇 |
1980年 | 57篇 |
1979年 | 48篇 |
1978年 | 48篇 |
1977年 | 46篇 |
1976年 | 34篇 |
1975年 | 30篇 |
排序方式: 共有10000条查询结果,搜索用时 718 毫秒
31.
《Mayo Clinic proceedings. Mayo Clinic》2022,97(6):1108-1113
ObjectiveTo determine the variability in county cardiovascular (CV) premature mortality explained by integrated metrics of socioeconomic deprivation and to explore temporal trends in CV mortality by county socioeconomic deprivation.MethodsThis is a cross-sectional analysis of US county-level death certificate data from 1999 to 2018 of age-adjusted premature (25 to 64 years) CV mortality. Integrated metrics of socioeconomic deprivation (Social Deprivation Index [SDI] and county Area Deprivation Index [ADI]) were associated with mortality using linear regression analysis. Relative change in county CV mortality from 1999 to 2018 was associated with indices using linear regression analysis.ResultsCounties with higher quartile SDI and ADI had significantly higher total, non-Hispanic Black/African American, and female premature CV mortality (P<.001). Both SDI and ADI were significantly associated with CV mortality by linear regression (P<.001) explaining 40% and 44% of county variability in CV mortality, respectively. Counties with lower deprivation indices experienced a larger decreased in premature CV mortality (P<.001).ConclusionThis study demonstrates an association between multiple integrated metrics of socioeconomic deprivation and premature cardiovascular mortality and shows potentially worsening disparities. 相似文献
32.
33.
《Journal of plastic, reconstructive & aesthetic surgery》2022,75(7):2108-2118
BackgroundWe describe the first clinical series of a novel bone replacement technique based on regenerative matching axial vascularisation (RMAV). This was used in four cases: a tibial defect after treatment of osteomyelitis; a calvarial defect after trauma and failed titanium cranioplasty; a paediatric tibial defect after neoadjuvant chemotherapy and resection of Ewing sarcoma; and a paediatric mandibular deficiency resulting from congenital hemifacial microsomia.MethodAll patients underwent reconstruction with three-dimensional (3D)-printed medical-grade polycaprolactone and tricalcium phosphate (mPCL-TCP) scaffolds wrapped in vascularised free corticoperiosteal flaps.OutcomeFunctional volumes of load-sharing regenerate bone have formed in all cases after a moderate duration of follow-up. At 36 cm, case 1 remains the longest segment of load bearing bone ever successfully reconstructed. This technique offers an alternative to existing methods of large volume bone defect reconstruction that may be safe, reliable, and give predictable outcomes in challenging situations. It achieves this by using a bioresorbable scaffold to support and direct the growth of regenerate bone, driven by RMAV.ConclusionThis technique may facilitate the reconstruction of bone defects previously thought unreconstructable, reduce the risk of long-term implant-related complications and achieve these outcomes in a hostile environment. These potential benefits must now be formally tested in prospective clinical trials. 相似文献
34.
35.
36.
37.
38.
39.
40.