全文获取类型
收费全文 | 200192篇 |
免费 | 49508篇 |
国内免费 | 1258篇 |
专业分类
耳鼻咽喉 | 3392篇 |
儿科学 | 6122篇 |
妇产科学 | 2551篇 |
基础医学 | 35621篇 |
口腔科学 | 7826篇 |
临床医学 | 23907篇 |
内科学 | 44555篇 |
皮肤病学 | 11318篇 |
神经病学 | 23295篇 |
特种医学 | 9518篇 |
外科学 | 30341篇 |
综合类 | 604篇 |
现状与发展 | 3篇 |
一般理论 | 52篇 |
预防医学 | 10699篇 |
眼科学 | 4554篇 |
药学 | 17172篇 |
中国医学 | 2306篇 |
肿瘤学 | 17122篇 |
出版年
2023年 | 722篇 |
2022年 | 538篇 |
2021年 | 5680篇 |
2020年 | 6990篇 |
2019年 | 13273篇 |
2018年 | 13345篇 |
2017年 | 13829篇 |
2016年 | 15437篇 |
2015年 | 16880篇 |
2014年 | 17848篇 |
2013年 | 19469篇 |
2012年 | 15756篇 |
2011年 | 15210篇 |
2010年 | 14930篇 |
2009年 | 10590篇 |
2008年 | 9930篇 |
2007年 | 8393篇 |
2006年 | 7709篇 |
2005年 | 6969篇 |
2004年 | 6183篇 |
2003年 | 5476篇 |
2002年 | 4885篇 |
2001年 | 3931篇 |
2000年 | 3626篇 |
1999年 | 2516篇 |
1998年 | 991篇 |
1997年 | 746篇 |
1996年 | 506篇 |
1995年 | 491篇 |
1994年 | 418篇 |
1993年 | 364篇 |
1992年 | 797篇 |
1991年 | 764篇 |
1990年 | 679篇 |
1989年 | 607篇 |
1988年 | 516篇 |
1987年 | 517篇 |
1986年 | 359篇 |
1985年 | 397篇 |
1984年 | 280篇 |
1983年 | 216篇 |
1982年 | 146篇 |
1981年 | 175篇 |
1980年 | 144篇 |
1979年 | 249篇 |
1978年 | 192篇 |
1977年 | 148篇 |
1976年 | 148篇 |
1975年 | 132篇 |
1974年 | 152篇 |
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
21.
Jean‐Franois Etter 《Addiction (Abingdon, England)》2019,114(12):2252-2256
22.
23.
Seulbi Lee Hyesook Park Soontae Kim Eun-Kyung Lee Jiyoung Lee Young Sun Hong Eunhee Ha 《International journal of hygiene and environmental health》2019,222(3):533-540
Background
It has been reported that particulate matter (PM) is associated with cardiovascular diseases (CVD) while metabolic syndrome is also an important risk factor for CVD. However, few studies have investigated the epidemiological association between PM and metabolic syndrome.Objective
To investigate the association between one-year exposure to PM with an aerodynamic diameter <2.5?μm (PM2.5) and the risk of metabolic syndrome in Korean adults without CVD.Methods
Exposure to PM2.5 was assessed using a Community Multiscale Air Quality (CMAQ) model. Metabolic syndrome was defined by National Cholesterol Education Program Adult Treatment Panel III. Andersen and Gill model with time-varying covariates, considering recurrent events, was used to investigate the association between one-year average PM2.5 and the risk of incident metabolic syndrome in 119,998 adults from the national health screening cohort provided by Korea National Health Insurance from 2009 to 2013.Results
Higher risk of metabolic syndrome, waist-based obesity, hypertension, hypertriglyceridemia, low HDL cholesterol, and hyperglycemia were significantly associated with a 10-μg/m3 increase in PM2.5 [adjusted hazard ratio (HR): 1.070, 1.510, 1.499, 1.468, 1.627 and 1.380, respectively]. In addition, the risk of metabolic syndrome associated with PM2.5 exposure was significant in the consistently obese group (obese at baseline and endpoint).Conclusion
Exposure to one-year average PM2.5 is associated with an increased risk of metabolic syndrome and its components in adults without CVD. These associations are particularly prominent in the consistently obese group (obese at baseline and endpoint). Our findings indicate that PM2.5 affects the onset of MS and its components which may lead to increase the risk of CVD. 相似文献24.
25.
26.
27.
Anne E. Kazak Fang Fang Chen Wei‐Ting Hwang Martha A. Askins Gabriela Vega E. Anders Kolb Anne Reilly Lamia P. Barakat 《Pediatric blood & cancer》2020,67(2)
Purpose: Family psychosocial risk in pediatric oncology can be assessed using the Psychosocial Assessment Tool (PAT), a brief parent report screener based on the Pediatric Psychosocial Preventative Health Model (PPPHM; universal, targeted, and clinical). However, little is known about risk over the course of treatment and its association with medical and psychosocial healthcare utilization. Methods: Primary caregivers of children with cancer participated in this prospective multisite investigation, completing the PAT at diagnosis (T1; n = 396) and 6 months later (T2; n = 304). Healthcare utilization data were extracted from electronic health records. Results: The distribution of PPPHM risk levels at T1 and T2 was highly consistent for the samples. Two‐thirds of families remained at the same level of risk, 18% decreased and 16% increased risk level. Risk was not related to sociodemographic or treatment variables. The PAT risk score correlated with psychosocial contacts over the 6‐month period. Conclusions: Although the majority of families reported universal (low) risk on the PAT and were stable in their risk level over 6 months, reassessing risk is helpful in identifying those families who report higher level of risk during treatment than at diagnosis. PAT scores were related to psychosocial services that are provided to most but not all families and could be tailored more specifically to match risk and delivery of evidence‐based care. 相似文献
28.
Ángel Becerra Héctor Trujillo Lucía Valencia Aurelio Rodríguez‐Pérez 《Brazilian Journal of Anesthesiology》2019,69(2):200-203
Background and objectives
A prompt and effective management of trauma patient is necessary. The aim of this case report is to highlight the importance of intraoperative echocardiography as a useful tool in patients suffering from refractory hemodynamic instability no otherwise explained.Case report
A 41 year‐old woman suffered a car accident. At the emergency department, no abnormalities were found in ECG or chest X‐ray. Abdominal ultrasound revealed the presence of abdominal free liquid and the patient was submitted to urgent exploratory laparotomy. Nevertheless, she persisted suffering arterial hypotension and metabolic acidosis. Looking for the reason of her hemodynamic instability, intraoperative transthoracic echocardiography was performed, finding out the presence of pericardial effusion. Once the cardiac surgeon extracted pericardial clots, patient's situation improved clinically and analytically.Conclusion
Every anesthesiologist should be able to use the intraoperative echocardiography as an effective tool in order to establish the appropriate measures to promote the survival of patients suffering severe trauma. 相似文献29.