全文获取类型
| 收费全文 | 1053870篇 |
| 免费 | 78762篇 |
| 国内免费 | 2839篇 |
专业分类
| 耳鼻咽喉 | 13709篇 |
| 儿科学 | 35825篇 |
| 妇产科学 | 29357篇 |
| 基础医学 | 152171篇 |
| 口腔科学 | 28998篇 |
| 临床医学 | 96115篇 |
| 内科学 | 205086篇 |
| 皮肤病学 | 23818篇 |
| 神经病学 | 85037篇 |
| 特种医学 | 40145篇 |
| 外国民族医学 | 305篇 |
| 外科学 | 158593篇 |
| 综合类 | 24352篇 |
| 一般理论 | 453篇 |
| 预防医学 | 82054篇 |
| 眼科学 | 23987篇 |
| 药学 | 75311篇 |
| 6篇 | |
| 中国医学 | 2076篇 |
| 肿瘤学 | 58073篇 |
出版年
| 2019年 | 8379篇 |
| 2018年 | 11849篇 |
| 2017年 | 9217篇 |
| 2016年 | 10464篇 |
| 2015年 | 11828篇 |
| 2014年 | 16197篇 |
| 2013年 | 24512篇 |
| 2012年 | 32902篇 |
| 2011年 | 35171篇 |
| 2010年 | 20817篇 |
| 2009年 | 19619篇 |
| 2008年 | 32591篇 |
| 2007年 | 34423篇 |
| 2006年 | 34884篇 |
| 2005年 | 33552篇 |
| 2004年 | 32611篇 |
| 2003年 | 31387篇 |
| 2002年 | 30114篇 |
| 2001年 | 47386篇 |
| 2000年 | 48462篇 |
| 1999年 | 40807篇 |
| 1998年 | 11867篇 |
| 1997年 | 10635篇 |
| 1996年 | 10663篇 |
| 1995年 | 10274篇 |
| 1994年 | 9486篇 |
| 1993年 | 8829篇 |
| 1992年 | 32579篇 |
| 1991年 | 31733篇 |
| 1990年 | 31273篇 |
| 1989年 | 30087篇 |
| 1988年 | 27434篇 |
| 1987年 | 27571篇 |
| 1986年 | 25647篇 |
| 1985年 | 24842篇 |
| 1984年 | 18639篇 |
| 1983年 | 15771篇 |
| 1982年 | 9620篇 |
| 1981年 | 8675篇 |
| 1979年 | 16993篇 |
| 1978年 | 12376篇 |
| 1977年 | 10446篇 |
| 1976年 | 9842篇 |
| 1975年 | 10253篇 |
| 1974年 | 12390篇 |
| 1973年 | 11903篇 |
| 1972年 | 10935篇 |
| 1971年 | 10149篇 |
| 1970年 | 9410篇 |
| 1969年 | 8756篇 |
排序方式： 共有10000条查询结果，搜索用时 15 毫秒
1.
2.
3.
Stelter K. Theodoraki M. N. Becker S. Tsekmistrenko V. Olzowy B. Ledderose G. 《European archives of oto-rhino-laryngology》2015,272(3):639-639
European Archives of Oto-Rhino-Laryngology - 相似文献
4.
5.
6.
Stephan Koter Tina U. Cohnert Korbinian B. Hindermayr Jörg Lindenmann Maximilian Brückner Wolfgang K. Oswald Georg Werkgartner Doris Wagner 《Journal of vascular surgery》2019,69(4):1227-1232
Objective
Low psoas muscle area is shown to be an indicator for worse postoperative outcome in patients undergoing vascular surgical. Additionally, it has been associated with longer durations of hospital stay in patients with cancer who undergo surgery and subsequently greater health care costs in Europe and the United States. We sought to evaluate this effect on hospital expenditure for patients undergoing vascular repair in a health care system with universal access.Methods
Skeletal muscle mass was assessed on preoperative abdominal computed tomography scans of patients undergoing open aortic aneurysm repair in a retrospective fashion. The skeletal muscle index (SMI) was used to define low muscle mass. Health care costs were obtained for all patients and the relationship between a low SMI and higher costs was explored using linear regression and cross-sectional analysis.Results
We included 156 patients (81.5% male) with a median age of 72 years undergoing elective surgery for infrarenal abdominal aortic aneurysm in this analysis. The median SMI for patients with low skeletal muscle mass was 53.21 cm2/kg and for patients without, 70.07 cm2/kg. Hospital duration of stay was 2 days longer in patients with low skeletal muscle mass as compared with patients with normal (14 days vs 11 days; P = .001), as was duration of intensive care stay (3 days vs 1 day; P = .01). The median overall hospital costs were €10,460 higher for patients with a low SMI as compared with patients with a normal physical constitution (€53,739 [interquartile range, €45,007-€62,471] vs €43,279 [interquartile range, €39,509-€47,049]; P = .001). After confounder adjustment, a low SMI was associated with a 14.68% cost increase in overall hospital costs, for a cost increase of €6521.Conclusions
Low skeletal muscle mass is independently associated with higher hospital as well as intensive care costs in patients undergoing elective aortic aneurysm repair. Strategies to reduce this risk factor are warranted for these patients. 相似文献7.
Emma J. Walker Noni E. MacDonald Nehal Islam Nicole Le Saux Karina A. Top Deshayne B. Fell 《Vaccine》2019,37(13):1725-1735
Objective
To systematically review literature on uptake and timeliness of diphtheria-tetanus-pertussis, measles-mumps-rubella, and/or polio-containing vaccines in infants who were born preterm, with a low birth weight, and/or with chronic health conditions that were diagnosed within the first 6?months of life.Methods
Using a standardized search strategy developed by a medical librarian, records were extracted from MEDLINE, Embase, Database of Abstracts of Reviews of Effects, and CINAHL up to May 8, 2018.Results
Out of the 1997 records that were screened, we identified 21 studies that met inclusion criteria. Eleven studies assessed vaccine coverage and/or timeliness in preterm infants, 6 in low birth weight infants, and 7 in children with chronic health conditions. Estimates of coverage in these populations were highly variable, ranging from 40% to 100% across the vaccines and population groups.Conclusions
There is a lack of studies reporting coverage and timeliness of routine immunizations in special populations of children.Policy implications
Our review suggests a need for improved surveillance of immunization status in special populations of infants, as well as a need for standardization of reporting practices. 相似文献8.
Vassiliki Costarelli Maria Michou Demosthenes B. Panagiotakos Christos Lionis 《International journal of food sciences and nutrition》2021,72(1):112-122
AbstractThe study examines Parental Feeding Practices (PFP) in relation to adherence to the Mediterranean Diet (MD) and children’s weight status. It’s a cross-sectional study of 402 parents (68.4% mothers), with children aged 2–12 years. Parents completed the Comprehensive Parental Feeding Questionnaire and the Mediterranean Diet Quality Index for children and adolescents (KIDMED), evaluating children’s adherence to the MD. Logistic regression showed that in children aged 2–<6 years, “emotion regulation/food as reward” and “pressure” decrease MD adherence (OR?=?0.186, p?<?0.0001 and OR?=?0.496, p?=?0.004), and “monitoring” decrease excess body weight (OR?=?0.284, p?=?0.009). In older children (6–12 years), “healthy eating guidance” and “monitoring” increase MD adherence (OR?=?3.262, p?=?0.001 and OR?=?3.147, p?<?0.0001), “child control” decreases MD adherence (OR?=?0.587, p?=?0.049), “pressure” decrease excess body weight (OR?=?0.495, p?<?0.0001) and “restriction” increase excess body weight (OR?=?1.784, p?=?0.015). “Healthy eating guidance” and “monitoring” seem to be the best PFP employed, in terms of children’s MD adherence and weight status. 相似文献
9.
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10.
Clint R. Bellenger John B. Arnold Jonathan D. Buckley Dominic Thewlis Joel T. Fuller 《Journal of Science and Medicine in Sport》2019,22(3):294-299