全文获取类型
收费全文 | 25705篇 |
免费 | 1953篇 |
国内免费 | 64篇 |
专业分类
耳鼻咽喉 | 230篇 |
儿科学 | 727篇 |
妇产科学 | 530篇 |
基础医学 | 3061篇 |
口腔科学 | 360篇 |
临床医学 | 2581篇 |
内科学 | 5012篇 |
皮肤病学 | 698篇 |
神经病学 | 2280篇 |
特种医学 | 1009篇 |
外国民族医学 | 1篇 |
外科学 | 3974篇 |
综合类 | 412篇 |
一般理论 | 60篇 |
预防医学 | 2220篇 |
眼科学 | 849篇 |
药学 | 1770篇 |
中国医学 | 17篇 |
肿瘤学 | 1931篇 |
出版年
2021年 | 324篇 |
2020年 | 227篇 |
2019年 | 344篇 |
2018年 | 427篇 |
2017年 | 366篇 |
2016年 | 398篇 |
2015年 | 447篇 |
2014年 | 699篇 |
2013年 | 1027篇 |
2012年 | 1526篇 |
2011年 | 1576篇 |
2010年 | 894篇 |
2009年 | 808篇 |
2008年 | 1522篇 |
2007年 | 1572篇 |
2006年 | 1562篇 |
2005年 | 1632篇 |
2004年 | 1589篇 |
2003年 | 1494篇 |
2002年 | 1474篇 |
2001年 | 406篇 |
2000年 | 314篇 |
1999年 | 338篇 |
1998年 | 298篇 |
1997年 | 273篇 |
1996年 | 256篇 |
1995年 | 267篇 |
1994年 | 235篇 |
1993年 | 231篇 |
1992年 | 273篇 |
1991年 | 251篇 |
1990年 | 229篇 |
1989年 | 229篇 |
1988年 | 201篇 |
1987年 | 191篇 |
1986年 | 187篇 |
1985年 | 221篇 |
1984年 | 211篇 |
1983年 | 214篇 |
1982年 | 239篇 |
1981年 | 247篇 |
1980年 | 204篇 |
1979年 | 162篇 |
1978年 | 171篇 |
1977年 | 165篇 |
1976年 | 108篇 |
1975年 | 130篇 |
1974年 | 143篇 |
1973年 | 109篇 |
1972年 | 92篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
Cheryl L. Rock PhD RD Cynthia A. Thomson PhD RD Kristen R. Sullivan MS MPH Carol L. Howe MD MLS Lawrence H. Kushi ScD Bette J. Caan DrPH Marian L. Neuhouser PhD RD Elisa V. Bandera MD PhD Ying Wang PhD Kimberly Robien PhD RD Karen M. Basen-Engquist PhD MPH Justin C. Brown PhD Kerry S. Courneya PhD Tracy E. Crane PhD RDN David O. Garcia PhD FACSM Barbara L. Grant MS RDN CSO FAND Kathryn K. Hamilton MA RDN CSO CDN FAND Sheri J. Hartman PhD Stacey A. Kenfield ScD Maria Elena Martinez PhD Jeffrey A. Meyerhardt MD MPH Larissa Nekhlyudov MD MPH Linda Overholser MD Alpa V. Patel PhD Bernardine M. Pinto PhD Mary E. Platek PhD RD CDN Erika Rees-Punia PhD MPH Colleen K. Spees PhD MEd RD LD FAND Susan M. Gapstur PhD Marjorie L. McCullough ScD RD 《CA: a cancer journal for clinicians》2022,72(3):230-262
The overall 5-year relative survival rate for all cancers combined is now 68%, and there are over 16.9 million survivors in the United States. Evidence from laboratory and observational studies suggests that factors such as diet, physical activity, and obesity may affect risk for recurrence and overall survival after a cancer diagnosis. The purpose of this American Cancer Society guideline is to provide evidence-based, cancer-specific recommendations for anthropometric parameters, physical activity, diet, and alcohol intake for reducing recurrence and cancer-specific and overall mortality. The audiences for this guideline are health care providers caring for cancer survivors as well as cancer survivors and their families. The guideline is intended to serve as a resource for informing American Cancer Society programs, health policy, and the media. Sources of evidence that form the basis of this guideline are systematic literature reviews, meta-analyses, pooled analyses of cohort studies, and large randomized clinical trials published since 2012. Recommendations for nutrition and physical activity during cancer treatment, informed by current practice, large cancer care organizations, and reviews of other expert bodies, are also presented. To provide additional context for the guidelines, the authors also include information on the relationship between health-related behaviors and comorbidities, long-term sequelae and patient-reported outcomes, and health disparities, with attention to enabling survivors' ability to adhere to recommendations. Approaches to meet survivors' needs are addressed as well as clinical care coordination and resources for nutrition and physical activity counseling after a cancer diagnosis. 相似文献
2.
An unprecedented mortality crisis befell the former socialist countries between 1989 and 1995, representing one of the greatest demographic shocks of the period after the Second World War. While it is likely that country‐level variation in the post‐socialist mortality crisis in Eastern Europe can be explained by a constellation of political and socio‐economic factors, no comprehensive review of the existing scholarly attempts at explaining these factors exists. We review 39 cross‐national multi‐variable peer reviewed studies of social determinants of mortality in post‐socialist Europe in order to assess the social factors behind the post‐socialist mortality crisis, determine the gaps in the existing literature and to make suggestions for future research. We propose a novel methodology to determine the relative importance of variables based on the ratio of significant to insignificant findings for each variable. The literature identifies inequality, welfare payments, religious composition, democracy, economic performance and unemployment as the leading factors that have a significant influence on mortality outcomes. Existing cross‐country studies fail to establish a definitive connection between mortality and diets, drinking patterns, liberalisation, trust, health expenditure and war. We also point out that the level of analysis is not a neutral methodological choice but might influence the results themselves. 相似文献
3.
Elvira D'Andrea Niteesh Kumar Choudhry Benjamin Raby Gerald Lawrence Weinhouse Mehdi Najafzadeh 《International journal of cancer. Journal international du cancer》2020,146(3):781-790
Bronchoscopy is the safest procedure for lung cancer diagnosis when an invasive evaluation is required after imaging procedures. However, its sensitivity is relatively low, especially for small and peripheral lesions. We assessed benefits and costs of introducing a bronchial gene-expression classifier (BGC) to improve the performance of bronchoscopy and the overall diagnostic process for early detection of lung cancer. We used discrete-event simulation to compare clinical and economic outcomes of two different strategies with the standard practice in former and current smokers with indeterminate nodules: (i) location-based strategy—integrated the BGC to the bronchoscopy indication; (ii) simplified strategy—extended use of bronchoscopy plus BGC also on small and peripheral lesions. Outcomes modeled were rate of invasive procedures, quality-adjusted-life-years (QALYs), costs and incremental cost-effectiveness ratios. Compared to the standard practice, the location-based strategy (i) reduced absolute rate of invasive procedures by 3.3% without increasing costs at the current BGC market price. It resulted in savings when the BGC price was less than $3,000. The simplified strategy (ii) reduced absolute rate of invasive procedures by 10% and improved quality-adjusted life expectancy, producing an incremental cost-effectiveness ratio of $10,109 per QALY. In patients with indeterminate nodules, both BGC strategies reduced unnecessary invasive procedures at high risk of adverse events. Moreover, compared to the standard practice, the simplified use of BGC for central and peripheral lesions resulted in larger QALYs gains at acceptable cost. The location-based is cost-saving if the price of classifier declines. 相似文献
4.
In this article we highlight the reminiscence of a distinguished Veteran of the Vietnam War. The narrative describes his wartime service in Vietnam and the legacy of these experiences across his military career and subsequent civilian life. The individual profiled is not intended to represent all Veterans who served in the Vietnam War. In fact, this is a very unique individual; a highly educated, career officer and committed Catholic who served in various roles within the United States Army Medical Department. This narrative represents memories and reflections from his military career and in his subsequent post-military civilian life. 相似文献
5.
6.
Lukasz M. Mazur Robert Adams Prithima R. Mosaly Joseph Nuamah Karthik Adapa Lawrence B. Marks 《Practical radiation oncology》2021,11(2):e124-e133
PurposeOur purpose was to assess the effect of a combined intervention – simulation-based training supported by neurofeedback sessions – on radiation technologists’ (RTs’) workload, situation awareness, and performance during routine quality assurance and treatment delivery tasks.Methods and MaterialsAs part of a prospective institutional review board approved study, 32 RTs previously randomized to receive versus not receive simulation-based training focused on patient safety were again randomized to receive versus not receive a 3-week neurofeedback intervention (8 sessions of alpha-theta protocol) focused on stress reduction as well as conscious precision, strong focus, and ability to solve arising problems. Perceived workload was quantified using the NASA Task Load Index. Situation awareness was quantified using the situation awareness rating technique. Performance score was calculated using procedural compliance with time-out components and error detection.ResultsRTs randomized to simulation-based training followed by neurofeedback sessions demonstrated no significant changes in perceived workload or situation awareness scores, but did have better performance compared with other study groups (P < .01).ConclusionsThis finding is encouraging and provides basis for using neurofeedback as means to possibly augment performance improvements gained during simulation-based training. 相似文献
7.
Vieri Grandi Antonello Baldo Emilio Berti Pietro Quaglino Serena Rupoli Mauro Alaibac Silvia Alberti-Violetti Paolo Amerio Valeria Brazzelli Pier Luigi Bruni Piergiacomo Calzavara-Pinton Aurora Parodi Emanuele Cozzani Martina Burlando Maria Concetta Fargnoli Daniele Gambini Paolo Iacovelli Alessia Pacifico Caterina Longo Giuseppe Monfrecola Alberico Motolese Giorgio Mozzicafreddo Carlo Cota Paolo Pigatto Alessandro Pileri Paola Savoia Marco Simonacci Marina Venturini Annamaria Offidani Elisa Molinelli Michele Pellegrino Emanuele Trovato Roberta Piccinno Karl Lawrence Nicola Pimpinelli 《Photodermatology, photoimmunology & photomedicine》2021,37(4):334-342
8.
9.
John M Apostolakos Joshua Wright-Chisem Lawrence V Gulotta Samuel A Taylor Joshua S Dines 《World journal of orthopedics》2021,12(1):1
The glenohumeral joint(GHJ) allows for a wide range of motion, but is also particularly vulnerable to episodes of instability. Anterior GHJ instability is especially frequent among young, athletic populations during contact sporting events. Many first time dislocators can be managed non-operatively with a period of immobilization and rehabilitation, however certain patient populations are at higher risk for recurrent instability and may require surgical intervention for adequate stabilization. Determination of the optimal treatment strategy should be made on a case-by-case basis while weighing both patient specific factors and injury patterns(i.e., bone loss). The purpose of this review is to describe the relevant anatomical stabilizers of the GHJ, risk factors for recurrent instability including bony lesions, indications for arthroscopic vs open surgical management, clinical history and physical examination techniques, imaging modalities, and pearls/pitfalls of arthroscopic soft-tissue stabilization for anterior glenohumeral instability. 相似文献
10.