全文获取类型
收费全文 | 4593篇 |
免费 | 174篇 |
国内免费 | 172篇 |
专业分类
耳鼻咽喉 | 57篇 |
儿科学 | 78篇 |
妇产科学 | 28篇 |
基础医学 | 187篇 |
口腔科学 | 33篇 |
临床医学 | 215篇 |
内科学 | 744篇 |
皮肤病学 | 8篇 |
神经病学 | 84篇 |
特种医学 | 102篇 |
外国民族医学 | 1篇 |
外科学 | 2233篇 |
综合类 | 576篇 |
现状与发展 | 1篇 |
预防医学 | 93篇 |
眼科学 | 92篇 |
药学 | 132篇 |
5篇 | |
中国医学 | 22篇 |
肿瘤学 | 248篇 |
出版年
2023年 | 79篇 |
2022年 | 120篇 |
2021年 | 156篇 |
2020年 | 156篇 |
2019年 | 184篇 |
2018年 | 161篇 |
2017年 | 110篇 |
2016年 | 130篇 |
2015年 | 120篇 |
2014年 | 295篇 |
2013年 | 285篇 |
2012年 | 207篇 |
2011年 | 216篇 |
2010年 | 180篇 |
2009年 | 220篇 |
2008年 | 272篇 |
2007年 | 283篇 |
2006年 | 170篇 |
2005年 | 187篇 |
2004年 | 170篇 |
2003年 | 147篇 |
2002年 | 133篇 |
2001年 | 100篇 |
2000年 | 87篇 |
1999年 | 92篇 |
1998年 | 75篇 |
1997年 | 48篇 |
1996年 | 48篇 |
1995年 | 64篇 |
1994年 | 49篇 |
1993年 | 32篇 |
1992年 | 31篇 |
1991年 | 27篇 |
1990年 | 31篇 |
1989年 | 28篇 |
1988年 | 31篇 |
1987年 | 30篇 |
1986年 | 33篇 |
1985年 | 31篇 |
1984年 | 33篇 |
1983年 | 13篇 |
1982年 | 18篇 |
1981年 | 12篇 |
1980年 | 12篇 |
1979年 | 12篇 |
1978年 | 7篇 |
1977年 | 4篇 |
1976年 | 5篇 |
1975年 | 2篇 |
1971年 | 1篇 |
排序方式: 共有4939条查询结果,搜索用时 390 毫秒
71.
72.
73.
74.
75.
76.
Maher El Chaar Peter Lundberg Jill Stoltzfus 《Surgery for obesity and related diseases》2018,14(5):545-551
Background
According to recent American Society for Metabolic and Bariatric Surgery estimates, sleeve gastrectomy (SG) is now the most commonly performed procedure in the United States (~53.8% of all bariatric procedures), followed by Roux-en-Y gastric bypass (RYGB; 23.1% of all procedures).Objectives
The objective of this study was to evaluate outcomes and safety of these 2 procedures in the first 30 days postoperatively using the Metabolic and Bariatric Surgery Accreditation and Quality Improvement Program data registry.Setting
University health network, United States.Methods
We reviewed all SG and RYGB cases entered between January 1 and December 31, 2015 in the Metabolic and Bariatric Surgery Accreditation and Quality Improvement Program data registry. Demographic characteristics and 30-day outcomes were analyzed based on separate Mann-Whitney rank sums tests, χ2, or Fisher's exact tests as appropriate, with P<.05 denoting statistical significance and no adjustment for multiple testing.Results
A total of 141,646 patients were analyzed; 98,292 underwent SG and 43,354 underwent RYGB. Average age was 44.5 and 45.4 years for SG and RYGB, respectively. Preoperative body mass index was 45.1 and 46.1 for SG and RYGB, respectively. The 30-day mortality was .1% for SG and .2% for RYGB (P<.05). The incidence of unplanned intensive care unit admission after RYGB was twice as high compared with SG (1.3% versus .6%, respectively, P<.05). The incidence of at least 1 intervention or reoperation after RYGB was significantly higher compared with SG (2.8% and 2.5% for GB versus 1.2% and 1% for SG, P<.05). After RYGB, .4% of patients had a drain left in place at 30 days postoperatively versus .3% for SG (P<.05). The incidence of readmission was 2.8% for RYGB and 1.2% for SG (P<.05).Conclusions
The incidence of postoperative complications in the first 30 days after surgery is low for both RYGB and SG. However, SG seems to have a better safety profile in the first 30 days postoperatively compared with RYGB. These findings should be considered in the preoperative evaluation and counseling of bariatric patients. Long-term follow-up is needed to compare safety and efficacy of SG versus RYGB. 相似文献77.
Taryn E. Hassinger J. Hunter Mehaffey Lily E. Johnston Robert B. Hawkins Bruce D. Schirmer Peter T. Hallowell 《Surgery for obesity and related diseases》2018,14(8):1133-1138
Background
Numerous studies have established the effectiveness of Roux-en-Y gastric bypass (RYGB) for weight loss and co-morbidity amelioration. However, its safety and efficacy in elderly patients remains controversial.Objectives
To evaluate outcomes in patients aged ≥60 years who underwent RYGB compared with nonsurgical controls with the hypothesis that RYGB provides weight loss benefits without differences in survival.Setting
University-affiliated tertiary center.Methods
All patients who underwent RYGB from 1985 to 2015 were identified and divided into elderly (age ≥60) and nonelderly (age <60) groups. A nonsurgical elderly control population was identified using a clinical data repository of outpatient visits to propensity match elderly patients 4:1 on demographic characteristics, co-morbidities, and relevant preoperative substance/medication use. Unpaired appropriate univariate analyses compared each stratified group. Kaplan-Meier survival curves were fitted based on social security death data.Results
A total of 2306 patients underwent RYGB. The 107 elderly patients had lower median body mass index (47.0 versus 49.9; P?=?.007) and higher rates of co-morbidities. Rates of complications did not differ between elderly and nonelderly patients. Elderly surgical patients were propensity matched 4:1 (10,044 controls) yielding 428 well-matched nonsurgical controls. The elderly group demonstrated significant percent reduction in excess body mass index compared with the control group (81.8% versus 10.3%; P < .001). Kaplan-Meier survival analysis with log-rank test demonstrated no difference in midterm survival (P?=?.63).Conclusions
A significant weight reduction benefit was identified after RYGB in elderly patients without a difference in midterm survival compared with propensity-matched controls, suggesting RYGB is a safe and efficacious weight loss strategy in the elderly. 相似文献78.
79.
Roux-en-Y gastric bypass surgery in youth with severe obesity: 1-year longitudinal changes in spexin
Seema Kumar MD Jobayer Hossain Thomas Inge P Babu Balagopal 《Surgery for obesity and related diseases》2018,14(10):1537-1543
Background
Spexin is a novel peptide predominantly produced in human white adipose tissue and has recently been implicated as a potential signal in the regulation of body weight, energy homeostasis, and satiety. The effect of bariatric surgery on spexin is unknown.Objectives
To study the effect of Roux-en-Y gastric bypass (RYGB) surgery on endogenous spexin concentration and various risk factors of type 2 diabetes and cardiovascular disease in youth with severe obesity.Setting
University hospital, United StatesMethods
Spexin, body mass index (BMI), insulin, glucose, total and high molecular weight adiponectin, leptin, and high sensitivity C- reactive protein were measured longitudinally (baseline, 6 mo, and 12 mo) after RYGB surgery in girls with severe obesity (n?=?12; age?=?16.7 ± 1.5 years; BMI?=?51.6 ± 2.9 kg/m2).Results
Serum spexin concentration increased (P?=?.01) at 6 months after surgery and stabilized afterward. Spexin level correlated negatively with homeostatic model assessment insulin resistance, HOMA-IR (Spearman correlation r?=??.796, P < .001) and positively with high molecular weight adiponectin (Spearman correlation r?=?.691, P?=?.011). The change in spexin concentration, from baseline to 6 months after surgery, was inversely correlated with the corresponding change in BMI (Spearman correlation r?=??.573, P?=?.051). Furthermore, the 6-month changes in spexin and HOMA-IR were inversely correlated (slope [standard error, SE]?=??.0084 (.0019), P?=?.001)], even after adjusting for the change in BMI.Conclusions
The enhancement of circulating spexin concentration in response to RYGB and correlations with beneficial postoperative changes in various adipokines in youth are novel findings that require further validation. 相似文献80.
Shinban Liu Christine J. Ren-Fielding Bradley Schwack Marina Kurian George A. Fielding 《Surgery for obesity and related diseases》2018,14(10):1501-1506