全文获取类型
收费全文 | 1384853篇 |
免费 | 100790篇 |
国内免费 | 3037篇 |
专业分类
耳鼻咽喉 | 20149篇 |
儿科学 | 41577篇 |
妇产科学 | 39925篇 |
基础医学 | 194287篇 |
口腔科学 | 40829篇 |
临床医学 | 119500篇 |
内科学 | 271746篇 |
皮肤病学 | 30827篇 |
神经病学 | 111246篇 |
特种医学 | 55302篇 |
外国民族医学 | 492篇 |
外科学 | 214168篇 |
综合类 | 32227篇 |
现状与发展 | 6篇 |
一般理论 | 497篇 |
预防医学 | 98324篇 |
眼科学 | 32534篇 |
药学 | 103524篇 |
3篇 | |
中国医学 | 3024篇 |
肿瘤学 | 78493篇 |
出版年
2018年 | 12630篇 |
2016年 | 11314篇 |
2015年 | 12674篇 |
2014年 | 17908篇 |
2013年 | 27184篇 |
2012年 | 35630篇 |
2011年 | 37632篇 |
2010年 | 22332篇 |
2009年 | 21608篇 |
2008年 | 36179篇 |
2007年 | 39314篇 |
2006年 | 39854篇 |
2005年 | 38532篇 |
2004年 | 37638篇 |
2003年 | 36336篇 |
2002年 | 35801篇 |
2001年 | 64880篇 |
2000年 | 66684篇 |
1999年 | 56585篇 |
1998年 | 15339篇 |
1997年 | 14028篇 |
1996年 | 13426篇 |
1995年 | 12722篇 |
1994年 | 11928篇 |
1992年 | 43642篇 |
1991年 | 42200篇 |
1990年 | 41406篇 |
1989年 | 40413篇 |
1988年 | 37789篇 |
1987年 | 37113篇 |
1986年 | 35613篇 |
1985年 | 33784篇 |
1984年 | 25447篇 |
1983年 | 21584篇 |
1982年 | 13034篇 |
1981年 | 11932篇 |
1979年 | 24458篇 |
1978年 | 17514篇 |
1977年 | 15220篇 |
1976年 | 13743篇 |
1975年 | 15595篇 |
1974年 | 18461篇 |
1973年 | 17922篇 |
1972年 | 17117篇 |
1971年 | 15982篇 |
1970年 | 15174篇 |
1969年 | 14586篇 |
1968年 | 13715篇 |
1967年 | 12253篇 |
1966年 | 11467篇 |
排序方式: 共有10000条查询结果,搜索用时 46 毫秒
91.
Paola Gilsanz Maria M. Corrada Claudia H. Kawas Elizabeth Rose Mayeda M. Maria Glymour Charles P. Quesenberry Catherine Lee Rachel A. Whitmer 《Alzheimer's & dementia》2019,15(4):497-505
Introduction
Little is known about dementia incidence in diverse populations of oldest-old, the age group with highest dementia incidence.Methods
Incident dementia diagnoses from 1/1/2010 to 9/30/2015 were abstracted from medical records for 2350 members of an integrated health care system in California (n = 1702 whites, n = 375 blacks, n = 105 Latinos, n = 168 Asians) aged ≥90 in 2010. We estimated race/ethnicity-specific age-adjusted dementia incidence rates and implemented Cox proportional hazards models and Fine and Gray competing risk of death models adjusted for demographics and comorbidities in midlife and late-life.Results
Dementia incidence rates (n = 771 cases) were lowest among Asians (89.9/1000 person-years), followed by whites (96.9/1000 person-years), Latinos (105.8/1000 person-years), and blacks (121.5/1000 person-years). Cox regression and competing risk models estimated 28% and 36% higher dementia risk for blacks versus whites adjusting for demographics and comorbidities.Discussion
Patterns of racial/ethnic disparities in dementia seen in younger older adults continue after the age of 90 years, though smaller in magnitude. 相似文献92.
93.
94.
95.
M.A. Mashrah T.A. Aldhohrah A. Abdelrehem Moustafa H.M. Al-Sharani A. Alrmali L. Wang 《International journal of oral and maxillofacial surgery》2021,50(1):21-31
Donor site morbidity following radial forearm flap (RFF) harvest remains a controversial issue. The aim of this meta-analysis was to answer the question “Are the range of wrist movements (range of motion, ROM) and hand strength affected after RFF harvesting?” The PubMed, Embase, Scopus, and Cochrane Library electronic databases were systematically searched (to December 2019). Self-controlled studies evaluating hand biomechanics after RFF harvest were included. Weighted mean differences with 95% confidence intervals were calculated using the random-effects model. The outcome variables were ROM, forearm movements, grip, and pinch strengths. Thirteen studies involving a total of 335 patients were included. With the exception of grip strength and supination, which showed statistically significant reductions of about 2.40 kg and 2.86° (P < 0.05), all other ROM, forearm movements, and pinch strengths showed an insignificant difference when the operated hand was compared to the non-operated hand (P > 0.05). Regression analysis showed that the method of donor site closure and size of the donor site defect had an insignificant impact on hand biomechanics. This study confirms the lack of discernible biomechanical morbidity after RFF transfer. The minimal reduction in hand biomechanics after RFF is considered to be clinically negligible. 相似文献
96.
97.
98.
Josh Greenstein Devjani Das Josie Acuna Monica Kapoor Cara Brown Abbas Husain Brendan Lally Barry Hahn 《The American journal of emergency medicine》2019,37(2):313-316
Background
In the emergency department, rib fractures are a common finding in patients who sustain chest trauma. Rib fractures may be a sign of significant, underlying pathology, especially in the elderly patients where rib fractures are associated with significant morbidity and mortality. To date, no studies have evaluated the ability of ultrasound to detect rib fractures using cadaver models and subsequently use this model as a teaching tool.Objectives
The purpose of this study was to determine if it is possible to generate rib fractures on cadaver models which could be accurately identified using ultrasound.Methods
This was a cross-sectional study performed during one session at a cadaver lab. A single hemithorax from four adult cadavers were used as models. Single rib fractures on each of rib five through eight were created. Four subjects, blinded to the normal versus fractured ribs, were asked to identify the presence of a fracture on each rib.Results
A total of 8 of 16 potential ribs had fractured induced by study staff. Mean accuracy was 55% for all subjects. The overall sensitivity and specificity for detecting rib fractures was 50% (CI: 31.89–68.11) and 59.38% (CI: 35.69–73.55) respectively. The overall PPV and NPV was 55.17% and 54.29% respectively.Conclusions
In this pilot study, subjects were not able to detect induced rib fractures using ultrasound on cadaver models. The use of this model as a teaching tool in the detection of rib fractures requires further investigation. 相似文献99.
100.
Eloise R. Galligan Leila H. Shayegan Christine T. Lauren Kimberly D. Morel 《Pediatric dermatology》2019,36(5):753-754
Shaving and other modes of epilation can cause undue anxiety, pain, or skin irritation in children. Here, we present hair trimming as a safe, painless, and cost‐effective alternative for patients with unwanted hair which may be performed indefinitely or until the child is old enough to direct management. In select cases, removing unwanted hair using this technique may facilitate dermatologic surveillance. 相似文献