全文获取类型
收费全文 | 3774篇 |
免费 | 270篇 |
国内免费 | 31篇 |
专业分类
耳鼻咽喉 | 39篇 |
儿科学 | 110篇 |
妇产科学 | 111篇 |
基础医学 | 571篇 |
口腔科学 | 53篇 |
临床医学 | 631篇 |
内科学 | 614篇 |
皮肤病学 | 66篇 |
神经病学 | 424篇 |
特种医学 | 96篇 |
外科学 | 350篇 |
综合类 | 54篇 |
一般理论 | 6篇 |
预防医学 | 403篇 |
眼科学 | 60篇 |
药学 | 231篇 |
中国医学 | 1篇 |
肿瘤学 | 255篇 |
出版年
2023年 | 26篇 |
2022年 | 37篇 |
2021年 | 75篇 |
2020年 | 66篇 |
2019年 | 80篇 |
2018年 | 81篇 |
2017年 | 59篇 |
2016年 | 94篇 |
2015年 | 88篇 |
2014年 | 103篇 |
2013年 | 169篇 |
2012年 | 244篇 |
2011年 | 248篇 |
2010年 | 155篇 |
2009年 | 140篇 |
2008年 | 216篇 |
2007年 | 241篇 |
2006年 | 223篇 |
2005年 | 253篇 |
2004年 | 201篇 |
2003年 | 255篇 |
2002年 | 196篇 |
2001年 | 42篇 |
2000年 | 24篇 |
1999年 | 43篇 |
1998年 | 48篇 |
1997年 | 44篇 |
1996年 | 23篇 |
1995年 | 36篇 |
1994年 | 29篇 |
1993年 | 30篇 |
1992年 | 21篇 |
1990年 | 15篇 |
1989年 | 14篇 |
1988年 | 18篇 |
1987年 | 17篇 |
1986年 | 21篇 |
1985年 | 22篇 |
1984年 | 21篇 |
1983年 | 19篇 |
1982年 | 29篇 |
1981年 | 27篇 |
1980年 | 27篇 |
1979年 | 25篇 |
1978年 | 20篇 |
1977年 | 18篇 |
1976年 | 25篇 |
1975年 | 13篇 |
1974年 | 14篇 |
1970年 | 12篇 |
排序方式: 共有4075条查询结果,搜索用时 46 毫秒
111.
112.
Raphael Isingo Alison Wringe Jim Todd Mark Urassa Doris Mbata Griter Maiseli Rose Manyalla John Changalucha Julius Mngara Ester Mwinuka Basia Zaba 《Tropical medicine & international health : TM & IH》2012,17(8):e15-e25
Objectives To describe trends in voluntary counselling and testing (VCT) use and to assess whether high‐risk and infected individuals are receiving counselling and learning their HIV status in rural Tanzania. Methods During two rounds of linked serological surveys (2003–2004 and 2006–2007) with anonymous HIV testing among adults, VCT was offered to all participants. The crude and adjusted odds ratios for completing VCT in each survey were calculated to compare uptake by demographic, behavioural and clinical characteristics, stratified by sex. Repeat testing patterns were also investigated. Results The proportion of participants completing VCT increased from 10% in 2003–2004 to 17% in 2006–2007, and among HIV‐infected persons from 14% to 25%. A higher proportion of men than women completed VCT in both rounds, but the difference declined over time. Socio‐demographic and behavioural factors associated with VCT completion were similar across rounds, including higher adjusted odds of VCT with increasing numbers of sexual partners in the past 12 months. The proportion having ever‐completed VCT reached 26% among 2006–2007 attendees, with repeat testing rates highest among those aged 35–44 years. Among 3923 participants attending both rounds, VCT completion in 2006–2007 was 17% among 3702 who were HIV negative in both rounds, 19% among 124 who were HIV infected in both rounds and 22% among 96 who seroconverted between rounds. Conclusion VCT services are attracting HIV‐infected and high‐risk individuals. However, 2 years after the introduction of antiretroviral therapy, the overall uptake remains low. Intensive mobilisation efforts are needed to achieve regular and universal VCT use. 相似文献
113.
Frank R. Kloss PhD Sarvpreet Singh MD Oliver Hächl MD DMD Julia Rentenberger MD Thomas Auberger MD Anna Kraft MD DMD Guenther Klima PhD Thomas Mitterlechner MD Doris Steinmüller‐Nethl PhD Bernd Lethaus MD DMD Michael Rasse PhD Guenter Lepperdinger PhD Robert Gassner PhD 《Head & neck》2013,35(2):235-241
114.
The purpose of this study was to identify the performance differences between two groups of Austrian dental students (one with a prior medical degree and one without a medical degree) during their dental school training and final dental licensure examination. A specific aim was to determine if having a medical degree is a predictive factor for dental students' scores on the Austrian Dental Admission Test (Austrian DAT), performance in the dental clinic, and scores on final exam. The study consisted of a retrospective analysis of 122 students (thirty-nine with a medical degree and eighty-three without a medical degree) who were enrolled in the Dental Clinic at Innsbruck Medical University, Innsbruck, Austria, between 2001 and 2006. Three performance categories were considered: Austrian DAT results, clinical performance after the first clinical year in dental school, and performance on the final dental licensure examination. Information on students' age, gender, and previous medical degree was collected from official records. Analyses with student's t-test and Pearson's chi-square test revealed that the students with a medical degree had significantly higher Austrian DAT total test scores, grade point averages after the first clinical year, and scores on the final exam. Additionally, those students had significantly better performance on the final exam in prosthodontics and oral and maxillofacial surgery. The linear regression analysis showed that a medical degree had an independent effect on average scores on the final exam, age, and Austrian DAT test scores, while gender showed no statistically significant effect. Overall, the study found that dental students with a prior medical degree had significantly higher Austrian DAT total test scores and performed significantly better in the first clinical year and on the final exam than those without a prior medical degree. 相似文献
115.
116.
117.
Reza Fardanesh Maria Adele Marino Daly Avendano Doris Leithner Katja Pinker Sunitha B. Thakur 《Journal of magnetic resonance imaging : JMRI》2019,50(4):1033-1046
Proton magnetic resonance spectroscopy (MRS) is a promising noninvasive diagnostic technique for investigation of breast cancer metabolism. Spectroscopic imaging data may be obtained following contrast‐enhanced MRI by applying the point‐resolved spectroscopy sequence (PRESS) or the stimulated echo acquisition mode (STEAM) sequence from the MR voxel encompassing the breast lesion. Total choline signal (tCho) measured in vivo using either a qualitative or quantitative approach has been used as a diagnostic test in the workup of malignant breast lesions. In addition to tCho metabolites, other relevant metabolites, including multiple lipids, can be detected and monitored. MRS has been heavily investigated as an adjunct to morphologic and dynamic MRI to improve diagnostic accuracy in breast cancer, obviating unnecessary benign biopsies. Besides its use in the staging of breast cancer, other promising applications have been recently investigated, including the assessment of treatment response and therapy monitoring. This review provides guidance on spectroscopic acquisition and quantification methods and highlights current and evolving clinical applications of proton MRS. Level of Evidence 5 Technical Efficacy: Stage 5 J. Magn. Reson. Imaging 2019. 相似文献
118.
119.
120.