全文获取类型
收费全文 | 3605篇 |
免费 | 348篇 |
国内免费 | 52篇 |
专业分类
耳鼻咽喉 | 142篇 |
儿科学 | 290篇 |
妇产科学 | 12篇 |
基础医学 | 413篇 |
口腔科学 | 22篇 |
临床医学 | 549篇 |
内科学 | 191篇 |
皮肤病学 | 3篇 |
神经病学 | 1088篇 |
特种医学 | 53篇 |
外科学 | 95篇 |
综合类 | 471篇 |
一般理论 | 4篇 |
预防医学 | 473篇 |
眼科学 | 10篇 |
药学 | 82篇 |
4篇 | |
中国医学 | 81篇 |
肿瘤学 | 22篇 |
出版年
2024年 | 2篇 |
2023年 | 90篇 |
2022年 | 68篇 |
2021年 | 134篇 |
2020年 | 157篇 |
2019年 | 160篇 |
2018年 | 173篇 |
2017年 | 169篇 |
2016年 | 158篇 |
2015年 | 172篇 |
2014年 | 230篇 |
2013年 | 525篇 |
2012年 | 215篇 |
2011年 | 189篇 |
2010年 | 132篇 |
2009年 | 161篇 |
2008年 | 155篇 |
2007年 | 152篇 |
2006年 | 163篇 |
2005年 | 126篇 |
2004年 | 97篇 |
2003年 | 91篇 |
2002年 | 75篇 |
2001年 | 60篇 |
2000年 | 65篇 |
1999年 | 31篇 |
1998年 | 32篇 |
1997年 | 32篇 |
1996年 | 23篇 |
1995年 | 21篇 |
1994年 | 19篇 |
1993年 | 19篇 |
1992年 | 8篇 |
1991年 | 15篇 |
1990年 | 10篇 |
1989年 | 10篇 |
1988年 | 9篇 |
1987年 | 6篇 |
1986年 | 3篇 |
1985年 | 9篇 |
1984年 | 7篇 |
1983年 | 7篇 |
1982年 | 7篇 |
1981年 | 3篇 |
1980年 | 4篇 |
1977年 | 1篇 |
1976年 | 1篇 |
1975年 | 2篇 |
1974年 | 1篇 |
1973年 | 5篇 |
排序方式: 共有4005条查询结果,搜索用时 15 毫秒
1.
《European annals of otorhinolaryngology, head and neck diseases》2022,139(1):21-27
ObjectivesThis document presents the fundamentals of speech audiometry in noise, general requirements for implementation and criteria for choice among the tests available in French according to the health-professional's needs.Material and methodsThe recommendations are based on a systematic analysis of the literature carried out by a multidisciplinary group of doctors, audiologists and audioprosthetists from all over France. They are graded A, B, C or expert opinion according to decreasing level of scientific evidence.ResultsEight tests of speech audiometry in noise can be used in France.ConclusionTo be complete, evaluation of hearing status requires testing understanding of speech in noise. The examination must begin with a minimum of two measurements familiarizing the subject with the test procedure. For initial diagnosis, adaptive procedures establishing the 50% speech reception threshold (SRT50) in noise are to be preferred in order to obtain a rapid and standardized measurement of perception of speech in noise. When the aim is to measure real-life speech comprehension, tests based on sentences, cocktail-party noise and free-field stimulation are to be preferred. Prosthetic gain is evaluated exclusively in free field. This is the only way to evaluate the contribution of binaurality and to measure perception in noise in an environment as close as possible to real life. In order to avoid acoustic interference in free field, at least five loudspeakers should be used, in particular for evaluating the effectiveness of directional microphones, CROS devices enabling sounds picked up in the damaged ear to be rerouted to the functional ear, or bimodal fitting (i.e., when hearing is enabled by two modalities: for example, hearing aid for one ear, cochlear implant for the other). 相似文献
2.
《Mayo Clinic proceedings. Mayo Clinic》2022,97(6):1114-1122
ObjectiveTo assess the frequency of silent brain infarcts (SBIs) and white matter disease (WMD) and associations with stroke risk factors (RFs) in a real-world population.Patients and MethodsThis was an observational study of patients 50 years or older in the Kaiser Permanente Southern California health system from January 1, 2009, through June 30, 2019, with head computed tomography or magnetic resonance imaging for nonstroke indications and no history of stroke, transient ischemic attack, or dementia. A natural language processing (NLP) algorithm was applied to the electronic health record to identify individuals with reported SBIs or WMD. Multivariable Poisson regression estimated risk ratios of demographic characteristics, RFs, and scan modality on the presence of SBIs or WMD.ResultsAmong 262,875 individuals, the NLP identified 13,154 (5.0%) with SBIs and 78,330 (29.8%) with WMD. Stroke RFs were highly prevalent. Advanced age was strongly associated with increased risk of SBIs (adjusted relative risks [aRRs], 1.90, 3.23, and 4.72 for those aged in their 60s, 70s, and ≥80s compared with those in their 50s) and increased risk of WMD (aRRs, 1.79, 3.02, and 4.53 for those aged in their 60s, 70s, and ≥80s compared with those in their 50s). Magnetic resonance imaging was associated with a reduced risk of SBIs (aRR, 0.87; 95% CI, 0.83 to 0.91) and an increased risk of WMD (aRR, 2.86; 95% CI, 2.83 to 2.90). Stroke RFs had modest associations with increased risk of SBIs or WMD.ConclusionAn NLP algorithm can identify a large cohort of patients with incidentally discovered SBIs and WMD. Advanced age is strongly associated with incidentally discovered SBIs and WMD. 相似文献
3.
4.
Function of cerebellum in control and coordination of motor function has been well established for several years. Recent functional magnetic resonance imaging (MRI) studies reveal activation of cerebellum with memory, speech and language tasks. We hypothesize that during every function in the brain signals are relayed to cerebellum. We seek to analyze cognitive, emotional and social functions of cerebellum in patients with brain tumors and epilepsy utilizing functional Magnetic Resonance Imaging. Fifty‐one consecutive adult patients who underwent functional MRI examination were retrospectively analyzed for various activation patterns involving cerebellum. The neuropsychological battery of tasks assessed motor, language, memory, visual and auditory functions. Cognitive ability of all participants was assessed by Montreal cognitive assessment (MOCA). Patterns were analyzed for specific lobes and locations in the cerebellum. We found that simultaneous cerebellar activation is a consistent finding with brain activation during every functional MRI task that we tested except visual task. The patterns of functional MRI cerebellar activation were similar in both patient subgroups and control subjects compared to previously described patterns in normal subjects. Clin. Anat. 32:1053–1060, 2019. © 2019 Wiley Periodicals, Inc. 相似文献
5.
6.
目的 基于看图说话语言任务,分析上海市5~7岁痉挛型脑瘫儿童言语流利性障碍的临床特征,为解决言语不流利性问题提供参考依据。方法 2020年11—12月在上海地区选取符合纳入标准的5~7岁痉挛型脑瘫儿童与普通儿童各44例为研究对象,以《做家务》主题图片作为测试材料收集语音样本,比较两组儿童在看图说话语言形式下语速、停顿、拖延与重复的言语流利性特征差异。结果 痉挛型脑瘫儿童的言语速率、构音速率得分低于普通儿童,差异有统计学意义(t=-44.288、-25.665,P<0.05);而异常停顿次数、异常停顿时长、拖延次数、拖延时长与重复次数得分高于普通儿童,差异有统计学意义(t=28.891、39.188、28.960、18.393、26.246,P<0.05)。结论 5~7岁痉挛型脑瘫儿童在连续语音过程中存在典型的言语流利性障碍特征,表现为语速偏慢、异常停顿、异常拖延与异常重复等问题。 相似文献
7.
《Vaccine》2022,40(6):924-933
The European Clinical Trial Regulation No 536/2014 is the first mandate for a non-technical, publicly disclosed, plain language summary (PLS) of clinical trial results. This easy-to-understand summary has the potential to inform the public about clinical trial results and thereby improve health literacy in vaccines.To investigate the utility of the PLS, we undertook 2 online surveys (July/October 2020) in the United Kingdom, the United States and India. Participants were selected by quota sampling to ensure representation of gender, age and parental status. Those lacking interest in vaccine clinical research were excluded. In survey 1, participants were questioned about their interest in and expectations of vaccine trial results. In survey 2, the perceptions of participants to a range of written communication styles used in publicly available PLSs were evaluated.A total of 66 (13%) and 122 (29%) individuals were excluded solely due to lack of interest in vaccine clinical research in surveys 1 and 2, respectively; 450 respondents (150/country) completed survey 1 and 300 (100/country) completed survey 2. In survey 1, there was a correlation (p < 0.01) between claimed knowledge of and trust in vaccines. Healthcare professionals were the most trusted source for vaccine information, while vaccine companies were ranked relatively low. In survey 2, infographic PLS formats were considered easiest to understand, most engaging and the strongest communicators. Emphasizing the main points of the infographics in the text did not improve comprehension or recall. Most respondents (86%) indicated that they would like to see this type of communication in the future.Overall, this research suggests that the PLS, by optimizing content and format, has a potential to increase health literacy, and thereby, as part of a wider integrated communication strategy, build vaccine knowledge and confidence. 相似文献
8.
Robert Y. Lee Lyndia C. Brumback William B. Lober James Sibley Elizabeth L. Nielsen Patsy D. Treece Erin K. Kross Elizabeth T. Loggers James A. Fausto Charlotta Lindvall Ruth A. Engelberg J. Randall Curtis 《Journal of pain and symptom management》2021,61(1):136-142.e2
ContextGoals-of-care discussions are an important quality metric in palliative care. However, goals-of-care discussions are often documented as free text in diverse locations. It is difficult to identify these discussions in the electronic health record (EHR) efficiently.ObjectivesTo develop, train, and test an automated approach to identifying goals-of-care discussions in the EHR, using natural language processing (NLP) and machine learning (ML).MethodsFrom the electronic health records of an academic health system, we collected a purposive sample of 3183 EHR notes (1435 inpatient notes and 1748 outpatient notes) from 1426 patients with serious illness over 2008–2016, and manually reviewed each note for documentation of goals-of-care discussions. Separately, we developed a program to identify notes containing documentation of goals-of-care discussions using NLP and supervised ML. We estimated the performance characteristics of the NLP/ML program across 100 pairs of randomly partitioned training and test sets. We repeated these methods for inpatient-only and outpatient-only subsets.ResultsOf 3183 notes, 689 contained documentation of goals-of-care discussions. The mean sensitivity of the NLP/ML program was 82.3% (SD 3.2%), and the mean specificity was 97.4% (SD 0.7%). NLP/ML results had a median positive likelihood ratio of 32.2 (IQR 27.5–39.2) and a median negative likelihood ratio of 0.18 (IQR 0.16–0.20). Performance was better in inpatient-only samples than outpatient-only samples.ConclusionUsing NLP and ML techniques, we developed a novel approach to identifying goals-of-care discussions in the EHR. NLP and ML represent a potential approach toward measuring goals-of-care discussions as a research outcome and quality metric. 相似文献
9.
Patrick C. Trettenbrein Giorgio Papitto Angela D. Friederici Emiliano Zaccarella 《Human brain mapping》2021,42(3):699
Sign language (SL) conveys linguistic information using gestures instead of sounds. Here, we apply a meta‐analytic estimation approach to neuroimaging studies (N = 23; subjects = 316) and ask whether SL comprehension in deaf signers relies on the same primarily left‐hemispheric cortical network implicated in spoken and written language (SWL) comprehension in hearing speakers. We show that: (a) SL recruits bilateral fronto‐temporo‐occipital regions with strong left‐lateralization in the posterior inferior frontal gyrus known as Broca''s area, mirroring functional asymmetries observed for SWL. (b) Within this SL network, Broca''s area constitutes a hub which attributes abstract linguistic information to gestures. (c) SL‐specific voxels in Broca''s area are also crucially involved in SWL, as confirmed by meta‐analytic connectivity modeling using an independent large‐scale neuroimaging database. This strongly suggests that the human brain evolved a lateralized language network with a supramodal hub in Broca''s area which computes linguistic information independent of speech. 相似文献
10.