全文获取类型
收费全文 | 1858篇 |
免费 | 214篇 |
国内免费 | 11篇 |
专业分类
耳鼻咽喉 | 12篇 |
儿科学 | 57篇 |
妇产科学 | 67篇 |
基础医学 | 200篇 |
口腔科学 | 46篇 |
临床医学 | 209篇 |
内科学 | 370篇 |
皮肤病学 | 26篇 |
神经病学 | 213篇 |
特种医学 | 202篇 |
外科学 | 250篇 |
综合类 | 47篇 |
预防医学 | 191篇 |
眼科学 | 26篇 |
药学 | 97篇 |
2篇 | |
中国医学 | 2篇 |
肿瘤学 | 66篇 |
出版年
2021年 | 23篇 |
2020年 | 14篇 |
2019年 | 25篇 |
2018年 | 26篇 |
2017年 | 26篇 |
2016年 | 19篇 |
2015年 | 27篇 |
2014年 | 44篇 |
2013年 | 53篇 |
2012年 | 68篇 |
2011年 | 62篇 |
2010年 | 47篇 |
2009年 | 53篇 |
2008年 | 60篇 |
2007年 | 74篇 |
2006年 | 75篇 |
2005年 | 63篇 |
2004年 | 60篇 |
2003年 | 65篇 |
2002年 | 65篇 |
2001年 | 62篇 |
2000年 | 64篇 |
1999年 | 43篇 |
1998年 | 43篇 |
1997年 | 40篇 |
1996年 | 33篇 |
1995年 | 26篇 |
1994年 | 30篇 |
1993年 | 24篇 |
1992年 | 50篇 |
1991年 | 39篇 |
1990年 | 40篇 |
1989年 | 56篇 |
1988年 | 46篇 |
1987年 | 55篇 |
1986年 | 46篇 |
1985年 | 58篇 |
1984年 | 37篇 |
1983年 | 30篇 |
1982年 | 21篇 |
1981年 | 21篇 |
1980年 | 19篇 |
1979年 | 31篇 |
1978年 | 20篇 |
1977年 | 14篇 |
1976年 | 25篇 |
1975年 | 27篇 |
1974年 | 21篇 |
1973年 | 18篇 |
1971年 | 16篇 |
排序方式: 共有2083条查询结果,搜索用时 500 毫秒
51.
We report on a case of a deforming arthropathy in a young man with a lysosomal storage disorder. A 31-year-old man with a
known diagnosis of mannosidosis presented with a painful swollen right elbow. Radiographs of his right elbow showed a disorganised
joint with multiple fragments resembling the appearances of a neuropathic joint. This case provides further evidence that
a deforming arthropathy may occur as part of the spectrum of skeletal abnormalities seen in mannosidosis.
Received: 17 November 1999 Revision requested: 13 December 1999 Revision received: 6 March 2000 Accepted: 9 March 2000 相似文献
52.
53.
Practitioner Review: Therapist variability,patient‐reported therapeutic alliance,and clinical outcomes in adolescents undergoing mental health treatment – a systematic review and meta‐analysis 下载免费PDF全文
54.
IntroductionAdaptive techniques to deliver radiotherapy to the bladder may ensure treatment accuracy whilst sparing organs at risk. This study assesses the frequency of when an alternative plan to the current standard may be beneficial and establish the treatment resource implications of adaptive techniques. Assess the variation in accuracy of skeletal surrogate compared to the target. Additionally describes a training package for therapeutic radiographers evaluating CBCT datasets for adaptive techniques.MethodsA library of three plans was created for each patient, small, standard and large. Weekly CBCT and planar imaging data were acquired from 10 bladder cancer patients receiving radical radiotherapy. Bladder volumes from weekly CBCT were compared to the planning scan. Image registration was performed using bone and soft tissue structures on the CBCT images. A database of images was created to develop competency assessment and a training package.ResultsMatching to a skeletal surrogate may under estimate movement of the target. Bladder volume can vary significantly during the course of treatment, even in the presence of bladder preparation protocols. The additional time required to implement this technique is 4 min per fraction compared to standard treatment with planar imaging.ConclusionsThis feasibility study is a useful process to facilitate the implementation of adaptive techniques. However a limitation of this study is the low number of CBCT datasets evaluated. The advent of IGRT and adaptive techniques gives increased confidence to reduce margins, consequently facilitating hypo-fractionation, and may provide a gain in linear accelerator efficiency and reduce the number of hospital visits for the patient. CBCT paired with a development programme for therapeutic radiographers is an effective and efficient means of implementing adaptive radiotherapy. 相似文献
55.
56.
'If anticoagulants had been administered sooner, my client would not have died' was a central claim put to us, as statistician expert witnesses, by a Claimant's and Defendant's lawyers. To assist other litigants, and without identifying the specific case, we set out the study types that contribute to the evidence base, and their limitations. We then explain why it is difficult to adduce evidence about the relative risk of dying from pulmonary embolism within 12 hours of admission to accident and emergency even when it is well accepted that anticoagulation reduces the risk of dying within the next seven days of patients at objectively confirmed risk of pulmonary embolism. No matter how much we may want an answer, or how tragic an individual outcome, we can only work from the available evidence or work to improve the evidence base, which needs to be resourced. 相似文献
57.
58.
59.
Umut Aypar Stephanie A. Smoley Beth A. Pitel Kathryn E. Pearce Roman M. Zenka George Vasmatzis Sarah H. Johnson James B. Smadbeck Jess F. Peterson Katherine B. Geiersbach Daniel L. Van Dyke Erik C. Thorland Robert B. Jenkins Rhett P. Ketterling Patricia T. Greipp Hutton M. Kearney Nicole L. Hoppman Linda B. Baughn 《European journal of haematology》2019,102(1):i-i
60.