全文获取类型
收费全文 | 161011篇 |
免费 | 10666篇 |
国内免费 | 1213篇 |
专业分类
耳鼻咽喉 | 2255篇 |
儿科学 | 3019篇 |
妇产科学 | 3741篇 |
基础医学 | 24035篇 |
口腔科学 | 3341篇 |
临床医学 | 15217篇 |
内科学 | 30756篇 |
皮肤病学 | 4341篇 |
神经病学 | 12046篇 |
特种医学 | 8082篇 |
外科学 | 21880篇 |
综合类 | 2157篇 |
现状与发展 | 5篇 |
一般理论 | 81篇 |
预防医学 | 9716篇 |
眼科学 | 4307篇 |
药学 | 13643篇 |
中国医学 | 1598篇 |
肿瘤学 | 12670篇 |
出版年
2023年 | 985篇 |
2022年 | 2739篇 |
2021年 | 4823篇 |
2020年 | 2465篇 |
2019年 | 3583篇 |
2018年 | 4401篇 |
2017年 | 3231篇 |
2016年 | 4186篇 |
2015年 | 5635篇 |
2014年 | 6905篇 |
2013年 | 8366篇 |
2012年 | 12642篇 |
2011年 | 12278篇 |
2010年 | 7247篇 |
2009年 | 6063篇 |
2008年 | 9256篇 |
2007年 | 9119篇 |
2006年 | 8377篇 |
2005年 | 7978篇 |
2004年 | 7118篇 |
2003年 | 6187篇 |
2002年 | 5373篇 |
2001年 | 4377篇 |
2000年 | 4026篇 |
1999年 | 3263篇 |
1998年 | 1309篇 |
1997年 | 989篇 |
1996年 | 949篇 |
1995年 | 862篇 |
1994年 | 750篇 |
1993年 | 642篇 |
1992年 | 1572篇 |
1991年 | 1569篇 |
1990年 | 1353篇 |
1989年 | 1236篇 |
1988年 | 1154篇 |
1987年 | 1030篇 |
1986年 | 1010篇 |
1985年 | 882篇 |
1984年 | 644篇 |
1983年 | 563篇 |
1982年 | 399篇 |
1981年 | 377篇 |
1980年 | 339篇 |
1979年 | 519篇 |
1978年 | 406篇 |
1977年 | 388篇 |
1976年 | 342篇 |
1974年 | 358篇 |
1973年 | 327篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
31.
32.
33.
34.
Christopher Yeh Cem Atillasoy John T. Seykora Vivian Lee 《Journal of cutaneous pathology》2021,48(1):171-173
Respiratory cysts are benign lesions lined by normal respiratory epithelium. There are few reported cases localized to the orbit, while those of the eyelid are exceedingly rare. Respiratory cysts usually arise either from a non‐hereditary congenital malformation, where they are distinguished as choristomatous, or from trauma. Here, we report a case of a 53‐year‐old man who presented with a large right lower eyelid cyst that was histopathologically diagnosed as a respiratory cyst. 相似文献
35.
Yeon Seok Lee June Hyunkyung Lee Jae Eun Choi Joo Young Kim Tae Young Han 《Pediatric dermatology》2021,38(1):290-291
Erythema induratum of Bazin (EIB) is a form of tuberculid resulting from hypersensitivity to tuberculosis antigen. EIB occurs most commonly in middle‐aged women and is not typically seen in children. Here, we present a rare case of EIB, presenting as a chronic nodular panniculitis, in a 10‐year‐old Korean boy. 相似文献
36.
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37.
Marginal rate-based analyses are widely used for the analysis of recurrent events in clinical trials. In many areas of application, the events are not instantaneous but rather signal the onset of a symptomatic episode representing a recurrent infection, respiratory exacerbation, or bout of acute depression. In rate-based analyses, it is unclear how to best handle the time during which individuals are experiencing symptoms and hence are not at risk. We derive the limiting value of the Nelson-Aalen estimator and estimators of the regression coefficients under a semiparametric rate-based model in terms of an underlying two-state process. We investigate the impact of the distribution of the episode durations, heterogeneity, and dependence on the asymptotic and finite sample properties of standard estimators. We also consider the impact of these features on power in trials designed to test intervention effects on rate functions. An application to a trial of individuals with herpes simplex virus is given for illustration. 相似文献
38.
39.
40.
Stress Testing Versus CT Angiography in Patients With Diabetes and Suspected Coronary Artery Disease
Abhinav Sharma Adrian Coles Nishant K. Sekaran Neha J. Pagidipati Michael T. Lu Daniel B. Mark Kerry L. Lee Hussein R. Al-Khalidi Udo Hoffmann Pamela S. Douglas 《Journal of the American College of Cardiology》2019,73(8):893-902