全文获取类型
收费全文 | 130075篇 |
免费 | 9693篇 |
国内免费 | 217篇 |
专业分类
耳鼻咽喉 | 1154篇 |
儿科学 | 3538篇 |
妇产科学 | 2681篇 |
基础医学 | 20254篇 |
口腔科学 | 3360篇 |
临床医学 | 11273篇 |
内科学 | 26313篇 |
皮肤病学 | 2213篇 |
神经病学 | 12557篇 |
特种医学 | 5315篇 |
外国民族医学 | 9篇 |
外科学 | 16309篇 |
综合类 | 559篇 |
现状与发展 | 1篇 |
一般理论 | 108篇 |
预防医学 | 15072篇 |
眼科学 | 2020篇 |
药学 | 7749篇 |
中国医学 | 266篇 |
肿瘤学 | 9234篇 |
出版年
2023年 | 567篇 |
2022年 | 938篇 |
2021年 | 2041篇 |
2020年 | 1472篇 |
2019年 | 2150篇 |
2018年 | 2708篇 |
2017年 | 2290篇 |
2016年 | 2476篇 |
2015年 | 2806篇 |
2014年 | 3834篇 |
2013年 | 5044篇 |
2012年 | 7751篇 |
2011年 | 7875篇 |
2010年 | 4070篇 |
2009年 | 4244篇 |
2008年 | 6948篇 |
2007年 | 7198篇 |
2006年 | 6857篇 |
2005年 | 6506篇 |
2004年 | 5585篇 |
2003年 | 5240篇 |
2002年 | 4784篇 |
2001年 | 4473篇 |
2000年 | 4410篇 |
1999年 | 3949篇 |
1998年 | 1645篇 |
1997年 | 1341篇 |
1996年 | 1417篇 |
1995年 | 1156篇 |
1994年 | 1085篇 |
1993年 | 982篇 |
1992年 | 2687篇 |
1991年 | 2417篇 |
1990年 | 2292篇 |
1989年 | 2139篇 |
1988年 | 1958篇 |
1987年 | 1714篇 |
1986年 | 1630篇 |
1985年 | 1562篇 |
1984年 | 1116篇 |
1983年 | 969篇 |
1982年 | 526篇 |
1981年 | 459篇 |
1980年 | 392篇 |
1979年 | 861篇 |
1978年 | 522篇 |
1977年 | 428篇 |
1974年 | 418篇 |
1973年 | 410篇 |
1972年 | 371篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
11.
12.
Maaike van Gerwen MD Naomi Alpert MS Raja Flores MD Emanuela Taioli MD PhD 《American journal of industrial medicine》2020,63(2):115-120
The association between asbestos exposure, mainly in occupational settings, and malignant mesothelioma has been well established; this has prompted several countries to establish mesothelioma epidemiologic surveillance programs often at the request of national agencies. This review compares currently existing mesothelioma registries worldwide to develop a concept model for a US real-time case capture mesothelioma registry. Five countries were identified with a mesothelioma specific registry, including Italy, France, UK, Australia, and South Korea. All, except the UK, used interviews to collect exposure data. Linkage with the national death index was available or was in future plans for all registries. The registries have limited information on treatment, quality of life, and other patient-centered outcomes such as symptoms and pain management. To thoroughly collect exposure data, “real-time” enrollment is preferable; to maximize the capture of mesothelioma cases, optimal coverage, and a simplified consent process are needed. 相似文献
13.
14.
15.
16.
17.
18.
Ragnhild B. Wijma Marloes Emous Merel van den Broek Anke Laskewitz Anneke C. Muller Kobold André P. van Beek 《Surgery for obesity and related diseases》2019,15(1):73-81
Background
Early dumping is a poorly defined and incompletely understood complication after Roux-en-Y gastric (RYGB).Objective
We performed a mixed-meal tolerance test in patients after RYGB to address the prevalence of early dumping and to gain further insight into its pathophysiology.Setting
The study was conducted in a regional hospital in the northern part of the Netherlands.Methods
From a random sample of patients who underwent primary RYGB between 2008 and 2011, 46 patients completed the mixed-meal tolerance test. The dumping severity score for early dumping was assessed every 30 minutes. A sum score at 30 or 60 minutes of ≥5 and an incremental score of ≥3 points were defined as indicating a high suspicion of early dumping. Blood samples were collected at baseline, every 10 minutes during the first half hour, and at 60 minutes after the start.Results
The prevalence of a high suspicion of early dumping was 26%. No differences were seen for absolute hematocrit value, inactive glucagon-like peptide-1, and vasoactive intestinal peptide between patients with or without early dumping. Patients at high suspicion of early dumping had higher levels of active glucagon-like peptide-1 and peptide YY.Conclusion
The prevalence of complaints at high suspicion of early dumping in a random population of patients after RYGB is 26% in response to a mixed-meal tolerance test. Postprandial increases in both glucagon-like peptide-1 and peptide YY are associated with symptoms of early dumping, suggesting gut L-cell overactivity in this syndrome. 相似文献19.
Anastasiia Panfilova Sarah E. Shelton Cristina Caresio Ruud J.G. van Sloun Filippo Molinari Hessel Wijkstra Paul A. Dayton Massimo Mischi 《Ultrasound in medicine & biology》2019,45(2):539-548
Dynamic contrast-enhanced ultrasound (DCE-US) has been proposed as a powerful tool for cancer diagnosis by estimation of perfusion and dispersion parameters reflecting angiogenic vascular changes. This work was aimed at identifying which vascular features are reflected by the estimated perfusion and dispersion parameters through comparison with acoustic angiography (AA). AA is a high-resolution technique that allows quantification of vascular morphology. Three-dimensional AA and 2-D DCE-US bolus acquisitions were used to monitor the growth of fibrosarcoma tumors in nine rats. AA-derived vascular properties were analyzed along with DCE-US perfusion and dispersion to investigate the differences between tumor and control and their evolution in time. AA-derived microvascular density and DCE-US perfusion exhibited good agreement, confirmed by their spatial distributions. No vascular feature was correlated with dispersion. Yet, dispersion provided better cancer classification than perfusion. We therefore hypothesize that dispersion characterizes vessels that are smaller than those visible with AA. 相似文献