全文获取类型
收费全文 | 778958篇 |
免费 | 56253篇 |
国内免费 | 1506篇 |
专业分类
耳鼻咽喉 | 10079篇 |
儿科学 | 25147篇 |
妇产科学 | 19342篇 |
基础医学 | 120669篇 |
口腔科学 | 21604篇 |
临床医学 | 71280篇 |
内科学 | 149434篇 |
皮肤病学 | 17598篇 |
神经病学 | 56159篇 |
特种医学 | 28580篇 |
外国民族医学 | 87篇 |
外科学 | 116428篇 |
综合类 | 15931篇 |
现状与发展 | 2篇 |
一般理论 | 260篇 |
预防医学 | 57435篇 |
眼科学 | 17935篇 |
药学 | 58712篇 |
3篇 | |
中国医学 | 2450篇 |
肿瘤学 | 47582篇 |
出版年
2021年 | 7403篇 |
2019年 | 7081篇 |
2018年 | 9738篇 |
2017年 | 7477篇 |
2016年 | 8297篇 |
2015年 | 9238篇 |
2014年 | 12638篇 |
2013年 | 18434篇 |
2012年 | 25240篇 |
2011年 | 26242篇 |
2010年 | 15349篇 |
2009年 | 14230篇 |
2008年 | 23883篇 |
2007年 | 25509篇 |
2006年 | 25718篇 |
2005年 | 23971篇 |
2004年 | 23232篇 |
2003年 | 21989篇 |
2002年 | 21374篇 |
2001年 | 37727篇 |
2000年 | 38323篇 |
1999年 | 31708篇 |
1998年 | 8587篇 |
1997年 | 7276篇 |
1996年 | 7517篇 |
1995年 | 7129篇 |
1994年 | 6565篇 |
1992年 | 24107篇 |
1991年 | 24013篇 |
1990年 | 23316篇 |
1989年 | 23003篇 |
1988年 | 20857篇 |
1987年 | 20260篇 |
1986年 | 19298篇 |
1985年 | 18154篇 |
1984年 | 13384篇 |
1983年 | 11317篇 |
1982年 | 6381篇 |
1979年 | 12165篇 |
1978年 | 8555篇 |
1977年 | 7198篇 |
1976年 | 6956篇 |
1975年 | 7672篇 |
1974年 | 8948篇 |
1973年 | 8518篇 |
1972年 | 8014篇 |
1971年 | 7462篇 |
1970年 | 7174篇 |
1969年 | 6593篇 |
1968年 | 6051篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
61.
Sweeka Alexander Gurjeet Dulku Sharbell Hashoul Donna B Taylor 《Journal of Medical Imaging and Radiation Oncology》2019,63(4):473-478
Contrast‐enhanced spectral mammography (CESM) has a number of uses including the work‐up of inconclusive findings on mammography, assessment of breast symptoms, cancer staging, evaluation of response to neoadjuvant chemotherapy and recently as an alternative to magnetic resonance imaging (MRI) in high‐risk screening. CESM can be swiftly incorporated into the workflow of busy breast clinics. We share our experiences with CESM at a large breast assessment centre in Western Australia. 相似文献
62.
63.
64.
65.
66.
Qianlai Luo Jonathan N. Hofmann Ruth M. Pfeiffer Cari M. Kitahara Minkyo Song Meredith S. Shiels 《International journal of cancer. Journal international du cancer》2023,153(1):64-72
In the United States, renal cell carcinoma (RCC) incidence and the prevalence of obesity, an established risk factor for RCC, have been increasing for several decades. RCC is more common among older individuals. We sought to quantify the contribution of excess adiposity to the rising incidence of RCC among individuals 60 years or older. National Institutes of Health-American Association of Retired Persons Diet and Health Study data (n = 453 859 participants, enrolled in 1995-1996, age at enrollment 50-71 years) were used to estimate multivariable-adjusted hazard ratios (HRs) for RCC across body mass index categories and HRs associated with smoking. Population attributable fractions (PAFs) were calculated using estimated HRs and annual overweight/obesity prevalence from the National Health Interview Survey (1985-2008). PAF estimates were combined with RCC incidence from Surveillance, Epidemiology and End Results-13 to calculate annual percent changes in RCC incidence attributable (and unrelated) to overweight/obesity. We found that between 1995 and 2018, among individuals aged 60 years and older, PAF for overweight/obesity increased from 18% to 29% for all RCCs. In comparison, the PAF for smoking declined from 12% to 9%. RCC incidence increased 1.8% per year (95% confidence interval [CI] 1.5%-2.1%) overall, while RCC incidence attributable to overweight/obesity increased 3.8% per year (95%CI 3.5%-4.2%) and RCC incidence unrelated to overweight/obesity increased 1.2% per year (95% CI 0.9%-1.4%). In conclusion, overweight/obesity appears to have contributed importantly to the rising incidence of RCC in the United States since the mid-1990s. Public health interventions focused on reducing overweight and obesity could help substantially in curbing this trend. 相似文献
67.
68.
Accuracy and Precision of Acetabular Component Placement With Imageless Navigation in Obese Patients
Leonard T. Buller Alexander S. McLawhorn Jose A. Romero Peter K. Sculco David J. Mayman 《The Journal of arthroplasty》2019,34(4):693-699
Background
Obesity is a risk factor for acetabular component malposition when total hip arthroplasty is performed with manual techniques. The utility of imageless navigation in obese patients remains unknown. This study compared the accuracy and precision of imageless navigation for component orientation between obese and nonobese patients.Methods
A total of 459 total hip arthroplasties performed for osteoarthritis using imageless navigation were reviewed from a single surgeon’s institutional review board–approved database. Einzel-Bild-Roentgen Analyse determined component orientation on 6-week postoperative anteroposterior radiographs. Mean orientation error (accuracy) and precision were compared between obese (body mass index ≥ 30 kg/m2) and nonobese patients. Regression analysis evaluated the influence of obesity on component position.Results
The difference in mean inclination and anteversion between obese and nonobese groups was 1.1° (43.0° ± 3.5°; range, 35.8°-57.8° vs 41.9° ± 4.4°; range, 33.0°-57.1° and 24.9° ± 6.3°; range, 14.2°-44.3° vs 23.8° ± 6.6°; range, 7.0°-38.6°, respectively). Inclination precision was better for nonobese patients. No difference in inclination accuracy or anteversion accuracy or precision was detected between groups. And 83% of components were placed within the target range. There was no relationship between obesity (dichotomized) and component placement outside the target ranges for inclination, anteversion, or both. As a continuous variable, increased body mass index correlated with higher odds of inclination outside the target zone (odds ratio, 1.06; P = .001).Conclusion
Using imageless navigation, inclination orientation was less precise for obese patients, but the observed difference is likely not clinically relevant. Accurate superficial registration of landmarks in obese patients is achievable, and the use of imageless navigation similarly improves acetabular component positioning in obese and nonobese patients.Level of Evidence
Therapeutic Level IV. 相似文献69.
70.
Angela J. Jacques-Tiura Deborah A. Ellis April Idalski Carcone Sylvie Naar Kathryn Brogan Hartlieb Elizabeth K. Towner Thomas N. Templin K.-L. Catherine Jen 《The Journal of adolescent health》2019,64(3):355-361