收费全文 | 2960篇 |
免费 | 152篇 |
国内免费 | 24篇 |
耳鼻咽喉 | 32篇 |
儿科学 | 78篇 |
妇产科学 | 134篇 |
基础医学 | 308篇 |
口腔科学 | 72篇 |
临床医学 | 179篇 |
内科学 | 533篇 |
皮肤病学 | 42篇 |
神经病学 | 158篇 |
特种医学 | 122篇 |
外科学 | 551篇 |
综合类 | 131篇 |
一般理论 | 2篇 |
预防医学 | 218篇 |
眼科学 | 110篇 |
药学 | 282篇 |
中国医学 | 29篇 |
肿瘤学 | 155篇 |
2023年 | 30篇 |
2022年 | 15篇 |
2021年 | 86篇 |
2020年 | 53篇 |
2019年 | 104篇 |
2018年 | 146篇 |
2017年 | 68篇 |
2016年 | 82篇 |
2015年 | 105篇 |
2014年 | 134篇 |
2013年 | 146篇 |
2012年 | 259篇 |
2011年 | 286篇 |
2010年 | 155篇 |
2009年 | 113篇 |
2008年 | 179篇 |
2007年 | 191篇 |
2006年 | 157篇 |
2005年 | 131篇 |
2004年 | 116篇 |
2003年 | 117篇 |
2002年 | 84篇 |
2001年 | 43篇 |
2000年 | 37篇 |
1999年 | 31篇 |
1998年 | 19篇 |
1997年 | 8篇 |
1996年 | 12篇 |
1995年 | 6篇 |
1994年 | 13篇 |
1993年 | 9篇 |
1992年 | 27篇 |
1991年 | 19篇 |
1990年 | 12篇 |
1989年 | 19篇 |
1988年 | 9篇 |
1987年 | 15篇 |
1986年 | 7篇 |
1985年 | 5篇 |
1984年 | 10篇 |
1983年 | 9篇 |
1982年 | 13篇 |
1981年 | 4篇 |
1980年 | 6篇 |
1978年 | 4篇 |
1977年 | 4篇 |
1976年 | 7篇 |
1974年 | 5篇 |
1973年 | 5篇 |
1971年 | 4篇 |
Studies have shown mixed findings regarding the impact of immigration policy changes on immigrants’ utilization of primary care.
MethodsWe used a difference-in-differences analysis to compare changes in missed primary care appointments over time across two groups: patients who received care in Spanish, Portuguese, or Haitian Creole, and non-Hispanic, white patients who received care in English.
ResultsAfter adjustment for age, sex, race, insurance, hospital system, and presence of chronic conditions, immigration policy changes were associated with an absolute increase in the missed appointment prevalence of 0.74 percentage points (95% confidence interval: 0.34, 1.15) among Spanish, Portuguese and Haitian-Creole speakers. We estimated that missed appointments due to immigration policy changes resulted in lost revenue of over $185,000.
ConclusionsWe conclude that immigration policy changes were associated with a significant increase in missed appointments among patients who receive medical care in languages other than English.
相似文献Aim: describe treatment approaches in selected countries to inform recommendations for improving care.
Methods: Evidence describing approaches to OUD care was collected and analyzed in a structured, comparative manner. Recommendations were developed based on experts’ clinical experience in the region.
Results: Care differs across countries assessed: Egypt, KSA, UAE, Oman, Kuwait, and Bahrain. Detoxification programs are the common treatment approach in Egypt, KSA, Oman, and Bahrain; integrated programs with opioid agonist therapy (OAT): UAE, Kuwait. Fear of misuse and diversion risk commonly limits access to OAT. Problems with sourcing medicines may limit treatment options. There is limited data on treatment needs or provision. Recommendations: develop effective policy and expert-led consensus on best practice for OUD in the region including integrated treatment programs, provide support for specialists and centers, include innovative medication choices with low diversion risk, promote collaborative work, coordinate data collection, and sharing.
Conclusions: There is important unmet need for OUD in the region and opportunity to improve services through collaboration to support change. Therapy options with reduced diversion risk may address barriers to care. 相似文献
The study evaluated the hepatoprotective activity of plant extracts of cinnamon and glycyrrhizin in distinct dosage ways to minimize the oxidative stress induced by carbon tetrachloride (CCl4) in BALB/cJ inbred albino mice. Fifteen albino mice were divided into five groups, each group containing three mice. Group A was referred as positive control while group B, C, D and E were injected intraperitoneally with 1 mL/kg body weight of CCl4 twice a week for 1 month. Group C and D were treated orally with isolated extracts of cinnamon @50 mg/kg and glycyrrhizin @50 mg/kg respectively on daily basis for 1 month. However, group E was treated orally with combination dose of cinnamon @50 mg/kg + glycyrrhizin @50 mg/kg body weight. The increase in the levels of alanine transaminase (ALT), aspartate transaminase (AST) and alkaline phosphatase (ALP), triglyceride (TG), malondialdehyde (MDA) and glucose were recorded in CCl4 induced liver injury in mice while there is decrease in the levels of total protein (TP), reduced glutathione (GSH), Superoxide dismutase (SOD) and catalase (CAT) in CCL4 intoxicated mice. Isolated therapy of plant extracts of cinnamon and glycyrrhizin decreased the levels of ALT, AST, ALP, MDA, TG and glucose whereas increase in TP, GSH, SOD and CAT was observed in plant extracts treated mice. The best restoration of all the above said parameters near to control was observed in group of mice treated with combination dose of cinnamon and glycyrrhizin @50 mg/kg. Therefore, the present study declared the antioxidative, anti-inflammatory and hepatoprotective activity of standardized extracts of cinnamon and glycyrrhizin and their potent defensive property.
相似文献