全文获取类型
收费全文 | 14333篇 |
免费 | 1208篇 |
国内免费 | 43篇 |
专业分类
耳鼻咽喉 | 203篇 |
儿科学 | 449篇 |
妇产科学 | 246篇 |
基础医学 | 1890篇 |
口腔科学 | 220篇 |
临床医学 | 1501篇 |
内科学 | 3098篇 |
皮肤病学 | 181篇 |
神经病学 | 1352篇 |
特种医学 | 505篇 |
外科学 | 2281篇 |
综合类 | 238篇 |
一般理论 | 27篇 |
预防医学 | 1223篇 |
眼科学 | 229篇 |
药学 | 960篇 |
中国医学 | 10篇 |
肿瘤学 | 971篇 |
出版年
2023年 | 121篇 |
2022年 | 182篇 |
2021年 | 442篇 |
2020年 | 254篇 |
2019年 | 428篇 |
2018年 | 550篇 |
2017年 | 393篇 |
2016年 | 384篇 |
2015年 | 410篇 |
2014年 | 574篇 |
2013年 | 643篇 |
2012年 | 1072篇 |
2011年 | 1063篇 |
2010年 | 614篇 |
2009年 | 554篇 |
2008年 | 903篇 |
2007年 | 901篇 |
2006年 | 824篇 |
2005年 | 826篇 |
2004年 | 782篇 |
2003年 | 589篇 |
2002年 | 601篇 |
2001年 | 167篇 |
2000年 | 147篇 |
1999年 | 167篇 |
1998年 | 129篇 |
1997年 | 92篇 |
1996年 | 86篇 |
1995年 | 75篇 |
1994年 | 66篇 |
1993年 | 58篇 |
1992年 | 95篇 |
1991年 | 124篇 |
1990年 | 105篇 |
1989年 | 101篇 |
1988年 | 79篇 |
1987年 | 81篇 |
1986年 | 92篇 |
1985年 | 89篇 |
1984年 | 59篇 |
1983年 | 58篇 |
1982年 | 37篇 |
1981年 | 41篇 |
1980年 | 38篇 |
1979年 | 42篇 |
1978年 | 34篇 |
1973年 | 44篇 |
1972年 | 37篇 |
1970年 | 33篇 |
1969年 | 33篇 |
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
11.
12.
Prior research has generally focused on characteristics of elderly persons that predict contact with community services or the volume of services used. In contrast, this study investigates how personal care and home health services are used in relation to assistance from primary kin caregivers. A typology was developed based on task sharing or segregation between kin caregivers and service providers, and four types of informal-formal linkages around these tasks were identified: kin independence, formal service specialization, dual specialization, and supplementation. Findings regarding predictors of the types showed that caregiver and care recipient need variables were most significant in differentiating among them, although caregiver gender also had some discriminatory power. 相似文献
13.
Edbert B Hsu Tamara L Thomas Eric B Bass Dianne Whyne Gabor D Kelen Gary B Green 《BMC medical education》2006,6(1):19-9
Background
Although training and education have long been accepted as integral to disaster preparedness, many currently taught practices are neither evidence-based nor standardized. The need for effective evidence-based disaster training of healthcare staff at all levels, including the development of standards and guidelines for training in the multi-disciplinary health response to major events, has been designated by the disaster response community as a high priority. We describe the application of systematic evidence-based consensus building methods to derive educational competencies and objectives in criteria-based preparedness and response relevant to all hospital healthcare workers. 相似文献14.
15.
Peter B. Richman MD Shari Dominguez MD David Kasper MD Frederick Chen MD Jeremy Friese MD Joseph Wood MD JD Joseph Collins MD Jeffrey A. Kline MD 《Academic emergency medicine》2006,13(3):295-301
Objectives: To determine interobserver agreement between radiologists for computed tomography (CT) angiography and venography. CT venography of the lower extremities combined with standard CT angiography of the chest may result in an increased overall diagnosis rate of venous thromboembolism (pulmonary embolism or deep venous thrombosis).
Methods: The study had a retrospective cohort design. The population consisted of emergency department patients who were evaluated for suspected pulmonary embolism. A random sample of 50 patients diagnosed and treated for venous thromboembolism and 50 age- and gender-matched patients whose CT angiograms and venograms were read as negative were enrolled. The original reading (R1) was compared with readings of two study radiologists: R2, a general radiologist, and R3, a radiologist with fellowship training in cross-sectional imaging. All readers were blinded to each other.
Results: Both R2 and R3 found both CT angiogram and venogram components technically adequate in 95% (95% CI = 89% to 98%) and 86% (95% CI = 78% to 92%) of studies, respectively. The agreement was very good for CT angiography (lowest agreement = 92%; lowest κ = 0.83) and was good for CT venography (85%, κ = 0.65). In nine cases, R1 read the CT angiogram as negative but the venogram as positive for DVT, whereas both R2 and R3 read both components as negative in four of these nine, suggesting a false-positive isolated DVT rate of 44% (95% CI = 19% to 73%). In no case did R1 read both scan components as negative when R2 and R3 agreed on presence of pulmonary embolism or DVT.
Conclusions: Diagnosis of pulmonary embolism on CT angiography is more reliable than diagnosis of isolated DVT on CT venography. 相似文献
Methods: The study had a retrospective cohort design. The population consisted of emergency department patients who were evaluated for suspected pulmonary embolism. A random sample of 50 patients diagnosed and treated for venous thromboembolism and 50 age- and gender-matched patients whose CT angiograms and venograms were read as negative were enrolled. The original reading (R1) was compared with readings of two study radiologists: R2, a general radiologist, and R3, a radiologist with fellowship training in cross-sectional imaging. All readers were blinded to each other.
Results: Both R2 and R3 found both CT angiogram and venogram components technically adequate in 95% (95% CI = 89% to 98%) and 86% (95% CI = 78% to 92%) of studies, respectively. The agreement was very good for CT angiography (lowest agreement = 92%; lowest κ = 0.83) and was good for CT venography (85%, κ = 0.65). In nine cases, R1 read the CT angiogram as negative but the venogram as positive for DVT, whereas both R2 and R3 read both components as negative in four of these nine, suggesting a false-positive isolated DVT rate of 44% (95% CI = 19% to 73%). In no case did R1 read both scan components as negative when R2 and R3 agreed on presence of pulmonary embolism or DVT.
Conclusions: Diagnosis of pulmonary embolism on CT angiography is more reliable than diagnosis of isolated DVT on CT venography. 相似文献
16.
17.
18.
Peripheral quantitative computed tomography in children and adolescents: the 2007 ISCD Pediatric Official Positions 总被引:2,自引:0,他引:2
Babette Zemel Shona Bass Teresa Binkley Gaele Ducher Heather Macdonald Heather McKay Laurie Moyer-Mileur John Shepherd Bonny Specker Kate Ward Didier Hans 《Journal of clinical densitometry》2008,11(1):59-74
Peripheral quantitative computed tomography (pQCT) has mainly been used as a research tool in children. To evaluate the clinical utility of pQCT and formulate recommendations for its use in children, the International Society of Clinical Densitometry (ISCD) convened a task force to review the literature and propose areas of consensus and future research. The types of pQCT technology available, the clinical application of pQCT for bone health assessment in children, the important elements to be included in a pQCT report, and quality control monitoring techniques were evaluated. The review revealed a lack of standardization of pQCT techniques, and a paucity of data regarding differences between pQCT manufacturers, models and software versions and their impact in pediatric assessment. Measurement sites varied across studies. Adequate reference data, a critical element for interpretation of pQCT results, were entirely lacking, although some comparative data on healthy children were available. The elements of the pQCT clinical report and quality control procedures are similar to those recommended for dual-energy X-ray absorptiometry. Future research is needed to establish evidence-based criteria for the selection of the measurement site, scan acquisition and analysis parameters, and outcome measures. Reference data that sufficiently characterize the normal range of variability in the population also need to be established. 相似文献
19.
Elizabeth Bass Robert R Campbell Dennis C Werner Audrey Nelson Tatjana Bulat 《Rehabilitation nursing》2004,29(6):215-220
Hip fractures among elderly people frequently result in permanent disabilities, nursing home placement, and death. The bulk of hip fracture research focuses on elderly women. Within the Veterans Health Administration (VHA), the majority of patients are men. There are no published national reports on hip fractures with large male samples, or on related inpatient mortality among veterans. This retrospective study of 13,546 veterans with hip fracture discharges from 1998-2002 found unadjusted mortality rates are higher in the VHA, compared with the general population. VHA patients tend to be older men in poor health who stay in the hospital longer Increased knowledge about the risks and outcomes associated with hip fractures in men could lead to improved primary and secondary injury-prevention programs. Rehabilitation nurses in acute care can be catalysts in proactively incorporating protective devices, screening for osteoporosis, and initiating lifestyle changes in their plans of care to optimize outcomes for hip fracture patients. 相似文献
20.