全文获取类型
收费全文 | 277949篇 |
免费 | 15851篇 |
国内免费 | 6956篇 |
专业分类
耳鼻咽喉 | 3042篇 |
儿科学 | 9478篇 |
妇产科学 | 3780篇 |
基础医学 | 21596篇 |
口腔科学 | 4786篇 |
临床医学 | 31805篇 |
内科学 | 46867篇 |
皮肤病学 | 3673篇 |
神经病学 | 12993篇 |
特种医学 | 13484篇 |
外国民族医学 | 22篇 |
外科学 | 38270篇 |
综合类 | 33191篇 |
现状与发展 | 27篇 |
一般理论 | 20篇 |
预防医学 | 27320篇 |
眼科学 | 4823篇 |
药学 | 26792篇 |
152篇 | |
中国医学 | 6235篇 |
肿瘤学 | 12400篇 |
出版年
2023年 | 2604篇 |
2022年 | 8508篇 |
2021年 | 12116篇 |
2020年 | 6963篇 |
2019年 | 13331篇 |
2018年 | 8466篇 |
2017年 | 6838篇 |
2016年 | 8239篇 |
2015年 | 11259篇 |
2014年 | 21418篇 |
2013年 | 19006篇 |
2012年 | 22274篇 |
2011年 | 19225篇 |
2010年 | 17303篇 |
2009年 | 16523篇 |
2008年 | 15052篇 |
2007年 | 14743篇 |
2006年 | 12559篇 |
2005年 | 8325篇 |
2004年 | 4464篇 |
2003年 | 3886篇 |
2002年 | 3037篇 |
2001年 | 2413篇 |
2000年 | 2185篇 |
1999年 | 1419篇 |
1998年 | 1823篇 |
1997年 | 1654篇 |
1996年 | 1337篇 |
1995年 | 1363篇 |
1994年 | 1298篇 |
1993年 | 965篇 |
1992年 | 1161篇 |
1991年 | 1056篇 |
1990年 | 1077篇 |
1989年 | 1044篇 |
1988年 | 968篇 |
1987年 | 854篇 |
1985年 | 2378篇 |
1984年 | 3017篇 |
1983年 | 2268篇 |
1982年 | 2347篇 |
1981年 | 2343篇 |
1980年 | 2027篇 |
1979年 | 1720篇 |
1978年 | 1354篇 |
1977年 | 1169篇 |
1976年 | 1229篇 |
1975年 | 923篇 |
1974年 | 877篇 |
1973年 | 823篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
111.
Alexander Real Chierika Ukogu Divya Krishnamoorthy Nicole Zubizarreta Samuel K. Cho Andrew C. Hecht James C. Iatridis 《The spine journal》2019,19(2):225-231
Background Context
Low back pain (LBP) is a common complaint in clinical practice of multifactorial origin. Although obesity has been thought to contribute to LBP primarily by altering the distribution of mechanical loads on the spine, the additional contribution of obesity-related conditions such as diabetes mellitus (DM) to LBP has not been thoroughly examined.Purpose
To determine if there is a relationship between DM and LBP that is independent of body mass index (BMI) in a large cohort of adult survey participants.Study Design
Retrospective analysis of prospectively collected National Health and Nutrition Examination Survey (NHANES) data to characterize associations between LBP, DM, and BMI in adults subdivided into 6 subpopulations: normal weight (BMI 18.5–25), overweight (BMI 25–30), and obese (BMI >30) diabetics and nondiabetics. Diabetes was defined with glycohemoglobin A1c (HbA1c) ≥6.5%.Patient Sample
11,756 participants from NHANES cohort.Outcome Measures
Percentage of LBP reported.Methods
LBP reported in the 1999-2004 miscellaneous pain NHANES questionnaire was the dependent variable examined. Covariates included HbA1c, BMI, age, and family income ratio to poverty as continuous variables as well as race, gender, and smoking as binary variables. Individuals were further subdivided by weight class and diabetes status. Regression and graphical analyses were performed on the study population as a whole and also on subpopulations.Results
Increasing HbA1c did not increase the odds of reporting LBP in the full cohort. However, multivariate logistic regression of the 6 subpopulations revealed that the odds of LBP significantly increased with increasing HbA1c levels in normal weight diabetics. No other subpopulations reported significant relationships between LBP and HbA1c. LBP was also significantly associated with BMI for normal weight diabetics and also for obese subjects regardless of their DM status.Conclusions
LBP is significantly related to DM status, but this relationship is complex and may interact with BMI. These results support the concept that LBP may be improved in normal weight diabetic subjects with improved glycemic control and weight loss, and that all obese LBP subjects may benefit from improved weight loss alone. 相似文献112.
113.
114.
115.
116.
117.
Conall T. Morgan Brigitte Mueller Varsha Thakur Vitor Guerra Callaghan Jull Luc Mertens Mark Friedberg Fraser Golding Mike Seed Steven E.S. Miner Edgar T. Jaeggi Cedric Manlhiot Lynne E. Nield 《The Canadian journal of cardiology》2019,35(4):453-461
Background
The purpose of the study was to evaluate the association between fetal echocardiographic measurements and the need for intervention (primary coarctation repair, staged coarctation repair, or catheter intervention) in prenatally diagnosed coarctation of the aorta.Methods
A single-centre retrospective cohort study (2005-2015) of 107 fetuses diagnosed with suspected coarctation of the aorta in the setting of an apex-forming left ventricle and antegrade flow across the mitral and aortic valves.Results
Median gestational age at diagnosis was 32 weeks (interquartile range, 23-35 weeks). Fifty-six (52%) did not require any neonatal intervention, 51 patients (48%) underwent a biventricular repair. In univariable analysis, an increase in ascending aorta (AAo) peak Doppler flow velocity (odds ratio [OR], 1.40 [95% confidence interval [CI], 1.05-1.91] per 20 cm/s; P = 0.03) was associated with intervention. No intervention was associated with larger isthmus size (OR, 0.23; P < 0.001), transverse arch diameter (OR, 0.23; P < 0.001), and aortic (OR, 0.72; P = 0.02), mitral (OR, 0.58; P = 0.001), and AAo (OR, 0.53; P < 0.001) z-scores. In multivariable analysis, higher peak AAo Doppler (OR, 2.51 [95% CI, 1.54-4.58] per 20 cm/s; P = 0.001) and younger gestational age at diagnosis (OR, 0.81 [95% CI, 0.70-0.93] per week; P = 0.005) were associated with intervention, whereas a higher AAo z-score (OR, 0.65 [95% CI, 0.43-0.94] per z; P = 0.029) and transverse arch dimension (OR, 0.44 [95% CI, 0.18-0.97]; P = 0.05) decreased the risk of intervention.Conclusions
In prenatally suspected coarctation, the variables associated with intervention comprised smaller AAo and transverse arch size, earlier gestational age at diagnosis, and the additional finding of a higher peak AAo Doppler. 相似文献118.
119.
120.
阐述当前“人工智能+X”背景下市场对医学信息管理专业人才能力的需求,分析医学信息管理专业人才培养现状,提出从重塑学科人才培养目标、优化课程内容与课程设置、建设“双师型”导师队伍、搭建多方协同共建共享在线平台及设立“政用产学研”联合培养基地等方面探索医学信息管理专业研究生培养模式,以期培养适应人工智能时代发展,具备学科优势特色的高层次、高水平、高质量的复合型、应用型、创新型人才。 相似文献