全文获取类型
收费全文 | 32213篇 |
免费 | 3078篇 |
国内免费 | 125篇 |
专业分类
耳鼻咽喉 | 328篇 |
儿科学 | 1062篇 |
妇产科学 | 629篇 |
基础医学 | 4561篇 |
口腔科学 | 411篇 |
临床医学 | 3877篇 |
内科学 | 7030篇 |
皮肤病学 | 762篇 |
神经病学 | 3460篇 |
特种医学 | 1036篇 |
外国民族医学 | 1篇 |
外科学 | 4682篇 |
综合类 | 239篇 |
一般理论 | 29篇 |
预防医学 | 2748篇 |
眼科学 | 392篇 |
药学 | 1885篇 |
中国医学 | 65篇 |
肿瘤学 | 2219篇 |
出版年
2023年 | 113篇 |
2022年 | 234篇 |
2021年 | 552篇 |
2020年 | 478篇 |
2019年 | 862篇 |
2018年 | 969篇 |
2017年 | 802篇 |
2016年 | 810篇 |
2015年 | 1007篇 |
2014年 | 1224篇 |
2013年 | 1707篇 |
2012年 | 1998篇 |
2011年 | 2201篇 |
2010年 | 1410篇 |
2009年 | 1299篇 |
2008年 | 1915篇 |
2007年 | 1987篇 |
2006年 | 1932篇 |
2005年 | 1992篇 |
2004年 | 1918篇 |
2003年 | 1937篇 |
2002年 | 1994篇 |
2001年 | 316篇 |
2000年 | 257篇 |
1999年 | 329篇 |
1998年 | 394篇 |
1997年 | 367篇 |
1996年 | 293篇 |
1995年 | 329篇 |
1994年 | 272篇 |
1993年 | 260篇 |
1992年 | 185篇 |
1991年 | 194篇 |
1990年 | 166篇 |
1989年 | 144篇 |
1988年 | 155篇 |
1987年 | 159篇 |
1986年 | 146篇 |
1985年 | 139篇 |
1984年 | 155篇 |
1983年 | 122篇 |
1982年 | 176篇 |
1981年 | 172篇 |
1980年 | 156篇 |
1979年 | 99篇 |
1978年 | 103篇 |
1977年 | 92篇 |
1976年 | 74篇 |
1975年 | 66篇 |
1972年 | 67篇 |
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
11.
12.
13.
14.
Hanna Lee Mary K. Tan Andrew T. Yan Paul Angaran Paul Dorian Claudia Bucci Jean C. Gregoire Alan D. Bell Martin S. Green Peter L. Gross Allan Skanes Charles R. Kerr L. Brent Mitchell Jafna L. Cox Vidal Essebag Brett Heilbron Krishnan Ramanathan Carl Fournier Shaun G. Goodman 《The Canadian journal of cardiology》2019,35(2):160-168
Background
Physicians treating nonvalvular atrial fibrillation (AF) assess stroke and bleeding risks when deciding on anticoagulation. The agreement between empirical and physician-estimated risks is unclear. Furthermore, the association between patient and physician sex and anticoagulation decision-making is uncertain.Methods
We pooled data from 2 national primary care physician chart audit databases of patients with AF (Facilitating Review and Education to Optimize Stroke Prevention in Atrial Fibrillation and Coordinated National Network to Engage Physicians in the Care and Treatment of Patients with Atrial Fibrillation Chart Audit) with a combined 1035 physicians (133 female, 902 male) and 10,927 patients (4567 female and 6360 male).Results
Male physicians underestimated stroke risk in female patients and overestimated risk in male patients. Female physicians estimated stroke risk well in female patients but underestimated the risk in male patients. Risk of bleeding was underestimated in all. Despite differences in risk assessment by physician and patient sex, > 90% of patients received anticoagulation across all subgroups. There was modest agreement between physician estimated and calculated (ie, CHADS2 score) stroke risk: Kappa scores were 0.41 (0.35-0.47) for female physicians and 0.34 (0.32-0.36) for male physicians.Conclusions
Our study is the first to examine the association between patient and physician sex influences and stroke and bleeding risk estimation in AF. Although there were differences in agreement between physician estimated stroke risk and calculated CHADS2 scores, these differences were small and unlikely to affect clinical practice; further, despite any perceived differences in the accuracy of risk assessment by sex, most patients received anticoagulation. 相似文献15.
16.
Vincent Laville Sigrid Le Clerc Khaled Ezzedine Randa Jdid Lieng Taing Toufik Labib Cdric Coulonges Damien Ulveling Pilar Galan Christiane Guinot Leopold Fezeu Frdrique Morizot Julie Latreille Denis Malvy Erwin Tschachler Jean‐Franois Zagury 《Experimental dermatology》2019,28(8):892-898
Sagging eyelid is considered as an outward of skin ageing and may cause medical issues. However, little is known about the factors involved in sagging eyelid. The study, which aims at determining genetic risk factors for eyelid sagging, was conducted in a cohort of 502 unrelated Caucasian women living in the Paris region. All included participants were aged between 44 and 70 years old (mean age, 57.6 years old). The severity of sagging eyelid was graded in 6 categories by a dermatologist using standardized photographs of the face. A genome wide association study adjusted on potential risk factors (including age and smoking habits) was conducted to identify genetic associations. Two single nucleotide polymorphisms in total linkage disequilibrium on chromosome 10, rs16927253 (P = 7.07 × 10‐10) and rs4746957 (P = 1.06 × 10‐8), were significantly associated with eyelid sagging severity. The rs16927253‐T and rs4746957‐A alleles showed a dominant protective effect towards eyelid sagging. These polymorphisms are located in intronic parts of the H2AFY2 gene which encodes a member of the H2A histone family and very close to the AIFM2 gene that induces apoptosis. Additionally, single nucleotide polymorphisms with a false discovery rate below 0.25 were located nearby the type XIII collagen COL13A1 gene on chromosome 10 and in the ADAMTS18 gene on chromosome 16. Several relevant genes were identified by the genome wide association study for their potential role in the sagging eyelid severity. 相似文献
17.
18.
19.
Martina A. Steurer Jean Costello Rebecca J. Baer Scott P. Oltman Sky K. Feuer Tania Pacheco-Werner Elizabeth Rogers Marta M. Jankowska Jessica Block Molly McCarthy Matthew S. Pantell Christina Chambers Kelli K. Ryckman Laura L. Jelliffe-Pawlowski 《Paediatric and perinatal epidemiology》2020,34(2):130-138
20.
Stanislas Grassin‐Delyle Michaela Semeraro Frantz Foissac Naim Bouazza Haleema Shakur‐Still Ian Roberts Jean‐Marc Treluyer Saïk Urien 《Fundamental & clinical pharmacology》2019,33(6):670-678
Tranexamic acid (TXA) is an antifibrinolytic drug that reduces surgical blood loss and death due to bleeding after trauma and post‐partum haemorrhage. One key issue for treatment success is early administration. While usually given intravenously, oral and intramuscular use would be useful in specific circumstances. Therefore, an understanding of TXA pharmacokinetics when given via different routes is valuable. The aim of this study was to perform an individual participant data meta‐analysis of pharmacokinetic studies with TXA given to healthy volunteers via different routes. We searched the following databases: PubMed, Web of Science, Wiley Online Library, Elsevier Science Direct and J‐STAGE. Individual subject data were extracted when available, otherwise arithmetic means were used. A population pharmacokinetic model was developed using nonlinear mixed effect modelling. Seven studies were included in the analysis with data from 10 patients for the IV route, six patients for the IM route and 114 patients for the oral route. The pharmacokinetics was ascribed to a two‐compartment model, and the main covariate was allometrically scaled bodyweight. Oral and IM bioavailabilities were 46 and 105%, respectively. For a 70 kg bodyweight, the population estimates were 7.6 L/h for clearance, 17.9 L for the volume of the central compartment, 2.5 L/h for the diffusional clearance and 16.6 L for the peripheral volume of distribution. Larger well‐designed studies are needed to describe the pharmacokinetics of TXA when given IM or as an oral solution before these can be recommended as alternatives to IV. 相似文献