全文获取类型
收费全文 | 9005篇 |
免费 | 2375篇 |
国内免费 | 115篇 |
专业分类
耳鼻咽喉 | 369篇 |
儿科学 | 190篇 |
妇产科学 | 286篇 |
基础医学 | 176篇 |
口腔科学 | 147篇 |
临床医学 | 2884篇 |
内科学 | 1667篇 |
皮肤病学 | 299篇 |
神经病学 | 681篇 |
特种医学 | 324篇 |
外科学 | 1277篇 |
综合类 | 354篇 |
预防医学 | 1677篇 |
眼科学 | 100篇 |
药学 | 188篇 |
1篇 | |
中国医学 | 97篇 |
肿瘤学 | 778篇 |
出版年
2023年 | 408篇 |
2022年 | 115篇 |
2021年 | 251篇 |
2020年 | 486篇 |
2019年 | 163篇 |
2018年 | 557篇 |
2017年 | 595篇 |
2016年 | 612篇 |
2015年 | 703篇 |
2014年 | 707篇 |
2013年 | 1034篇 |
2012年 | 381篇 |
2011年 | 331篇 |
2010年 | 508篇 |
2009年 | 629篇 |
2008年 | 299篇 |
2007年 | 233篇 |
2006年 | 271篇 |
2005年 | 187篇 |
2004年 | 144篇 |
2003年 | 114篇 |
2002年 | 98篇 |
2001年 | 182篇 |
2000年 | 115篇 |
1999年 | 151篇 |
1998年 | 270篇 |
1997年 | 284篇 |
1996年 | 310篇 |
1995年 | 245篇 |
1994年 | 173篇 |
1993年 | 117篇 |
1992年 | 83篇 |
1991年 | 81篇 |
1990年 | 71篇 |
1989年 | 90篇 |
1988年 | 70篇 |
1987年 | 54篇 |
1986年 | 47篇 |
1985年 | 51篇 |
1984年 | 45篇 |
1983年 | 42篇 |
1982年 | 30篇 |
1981年 | 43篇 |
1980年 | 19篇 |
1979年 | 10篇 |
1978年 | 12篇 |
1977年 | 15篇 |
1976年 | 13篇 |
1975年 | 9篇 |
1970年 | 7篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
目的 观察双能量CT (DECT)定量参数术前预测实性肺腺癌气道播散(STAS)状态的价值。方法 回顾性分析52例经手术病理确诊实性肺腺癌患者的DECT及病理学资料,评估其STAS状态(阳性或阴性);对比STAS阳性、阴性实性肺腺癌CT表现(最大径、周围不透明影、空气支气管征、胸膜凹陷征)及DECT定量参数的差异。针对差异有统计学意义的DECT定量参数绘制受试者工作特征(ROC)曲线,计算曲线下面积(AUC),评估DECT定量参数单独及联合预测实性肺腺癌STAS的效能,并以二元logistic回归分析筛选实性肺腺癌STAS的独立预测因子。结果 52例中,25例STAS阳性,27例STAS阴性,其间病灶CT表现差异均无统计学意义(P均>0.05),DECT定量参数中的动脉期碘浓度(ICA)、动脉期标准化碘浓度(NICA)及静脉期碘浓度(ICV)差异均有统计学意义(P均<0.05)。ICA、NICA及ICV预测实性肺腺癌STAS的AUC为0.82、0.83及0.73;ICA和NICA均为实性肺腺癌STAS的独立预测因子,其联合AUC为0.89。结论 DECT定量参数可有效预测实性肺腺癌STAS。 相似文献
2.
3.
Anna Ugalde BA PhD Victoria White BA MA PhD Nicole M. Rankin BA MSc PhD Christine Paul BA PhD Catherine Segan BA PhD Sanchia Aranda RN BAppSci MN PhD Anna Wong Shee BSc BAppSc PhD Alison M. Hutchinson RN BApp Sci MBioth PhD Patricia M. Livingston BA PhD 《CA: a cancer journal for clinicians》2022,72(3):266-286
Smoking cessation reduces the risk of death, improves recovery, and reduces the risk of hospital readmission. Evidence and policy support hospital admission as an ideal time to deliver smoking-cessation interventions. However, this is not well implemented in practice. In this systematic review, the authors summarize the literature on smoking-cessation implementation strategies and evaluate their success to guide the implementation of best-practice smoking interventions into hospital settings. The CINAHL Complete, Embase, MEDLINE Complete, and PsycInfo databases were searched using terms associated with the following topics: smoking cessation, hospitals, and implementation. In total, 14,287 original records were identified and screened, resulting in 63 eligible articles from 56 studies. Data were extracted on the study characteristics, implementation strategies, and implementation outcomes. Implementation outcomes were guided by Proctor and colleagues' framework and included acceptability, adoption, appropriateness, cost, feasibility, fidelity, penetration, and sustainability. The findings demonstrate that studies predominantly focused on the training of staff to achieve implementation. Brief implementation approaches using a small number of implementation strategies were less successful and poorly sustained compared with well resourced and multicomponent approaches. Although brief implementation approaches may be viewed as advantageous because they are less resource-intensive, their capacity to change practice in a sustained way lacks evidence. Attempts to change clinician behavior or introduce new models of care are challenging in a short time frame, and implementation efforts should be designed for long-term success. There is a need to embrace strategic, well planned implementation approaches to embed smoking-cessation interventions into hospitals and to reap and sustain the benefits for people who smoke. 相似文献
4.
5.
Lauren L. O'Mahoney PhD Patrick J. Highton PhD Laura Kudlek MSc Jessica Morgan BA Rosie Lynch BA Ella Schofield BMBCh Nayanika Sreejith BA Ajay Kapur BMBCh Afolarin Otunla BA Sven Kerneis BMBCh Olivia James BA Karen Rees PhD Ffion Curtis PhD Kamlesh Khunti FMedSci Jamie Hartmann-Boyce DPhil 《Diabetes, obesity & metabolism》2022,24(9):1850-1860
6.
7.
8.
Cari Levy MD PhD Sheryl Zimmerman PhD Vincent Mor PhD David Gifford MD Sherry A. Greenberg PhD RN GNP-BC Juliet Holt Klinger MA Cathy Lieblich MA Sunny Linnebur PharmD Angie McAllister BA Arif Nazir MD Douglas Pace NHA Robyn Stone PhD Barbara Resnick PhD RN CRNP Philip D. Sloane MD Joseph Ouslander MD Joseph E. Gaugler PhD 《Journal of the American Geriatrics Society》2022,70(3):709-717
Randomized controlled trials are considered the most rigorous research design in efficacy and effectiveness research; however, such trials present numerous challenges that limit their applicability in real-world settings. As a consequence, pragmatic trials are increasingly viewed as a research design that overcomes some of these barriers with the potential to produce findings that are more reproducible. Although pragmatic methodology in long-term care is receiving increasing attention as an approach to improve successful dissemination and implementation, pragmatic trials present complexities of their own. To address these complexities and related issues, experts with experience conducting pragmatic trials, developing nursing home policy, participating in advocacy efforts, and providing clinical care in long-term care settings participated in a virtual consensus conference funded by the National Institute on Aging in Spring 2021. Participants identified 4 cross-cutting principles key to dissemination and implementation of pragmatic trial interventions: (1) stakeholder engagement, (2) diversity and inclusion, (3) organizational strain and readiness, and (4) learn from adaptations. Participants emphasized that implementation processes must be grounded in the perspectives of the people who will ultimately be responsible for implementing the intervention once it is proven to be effective. In addition, messaging must speak to long-term care staff and all others who have a stake in its outcomes. Although our understanding of dissemination and implementation strategies remains underdeveloped, this article is designed to guide long-term care researchers and community providers who are increasingly aware of the need for pragmatism in disseminating and implementing evidence-based care interventions. 相似文献
9.
10.
Loren Saulsberry PhD Ankur Bhargava MD MPH Sharon Zeng BA Jason B. Gibbons PhD Cody Brannan MS Diane S. Lauderdale PhD Robert D. Gibbons PhD 《Health services research》2023,58(4):873-881