全文获取类型
收费全文 | 18881篇 |
免费 | 1934篇 |
国内免费 | 134篇 |
专业分类
耳鼻咽喉 | 90篇 |
儿科学 | 714篇 |
妇产科学 | 265篇 |
基础医学 | 1775篇 |
口腔科学 | 375篇 |
临床医学 | 3557篇 |
内科学 | 1788篇 |
皮肤病学 | 53篇 |
神经病学 | 3131篇 |
特种医学 | 149篇 |
外科学 | 1041篇 |
综合类 | 1426篇 |
一般理论 | 24篇 |
预防医学 | 4896篇 |
眼科学 | 51篇 |
药学 | 895篇 |
57篇 | |
中国医学 | 140篇 |
肿瘤学 | 522篇 |
出版年
2024年 | 78篇 |
2023年 | 514篇 |
2022年 | 610篇 |
2021年 | 975篇 |
2020年 | 1026篇 |
2019年 | 1069篇 |
2018年 | 950篇 |
2017年 | 1017篇 |
2016年 | 885篇 |
2015年 | 883篇 |
2014年 | 1240篇 |
2013年 | 2312篇 |
2012年 | 988篇 |
2011年 | 979篇 |
2010年 | 677篇 |
2009年 | 743篇 |
2008年 | 765篇 |
2007年 | 706篇 |
2006年 | 638篇 |
2005年 | 511篇 |
2004年 | 433篇 |
2003年 | 406篇 |
2002年 | 337篇 |
2001年 | 264篇 |
2000年 | 231篇 |
1999年 | 188篇 |
1998年 | 188篇 |
1997年 | 161篇 |
1996年 | 119篇 |
1995年 | 116篇 |
1994年 | 90篇 |
1993年 | 107篇 |
1992年 | 79篇 |
1991年 | 78篇 |
1990年 | 65篇 |
1989年 | 69篇 |
1988年 | 54篇 |
1987年 | 45篇 |
1986年 | 64篇 |
1985年 | 50篇 |
1984年 | 33篇 |
1983年 | 31篇 |
1982年 | 32篇 |
1981年 | 18篇 |
1980年 | 22篇 |
1979年 | 22篇 |
1978年 | 16篇 |
1977年 | 17篇 |
1976年 | 13篇 |
1975年 | 12篇 |
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
151.
152.
153.
The buffering effect of social support on the negative effects of racism exposure on health outcomes has been mixed in prior studies regarding Asian Americans. Based on the stress-coping framework and using structural equation modelling (SEM) methods, we tested a theoretical model portraying simultaneous mediational paths from racism exposure to general physical and mental health through racism-related stress. Bootstrap analysis was used to test the indirect effects present in the model. Additionally, multi-group SEM analysis was conducted to investigate the moderation effect of social support from family and friends on the paths in the model. The sample consisted of 310 Asian American adults who completed an online survey. The results from the two-step SEM analysis and bootstrap analysis supported the theoretical model—racism exposure can simultaneously have a negative indirect effect on Asian Americans' physical and mental health via racism-related stress. Multi-group SEM analysis showed that there were no differences in model path coefficients based on having varying levels of social support from friends or family. 相似文献
154.
155.
Sarah Duncan-Park Claire Dunphy Jacqueline Becker Christine D’Urso Rachel Annunziato Joshua Blatter Carol Conrad Samuel B. Goldfarb Don Hayes Jr. Ernestina Melicoff Marc Schecter Gary Visner Brian Armstrong Hyunsook Chin Karen Kesler Nikki M. Williams Jonah N. Odim Stuart C. Sweet Lara Danziger-Isakov Eyal Shemesh 《American journal of transplantation》2021,21(9):3112-3122
Remote interventions are increasingly used in transplant medicine but have rarely been rigorously evaluated. We investigated a remote intervention targeting immunosuppressant management in pediatric lung transplant recipients. Patients were recruited from a larger multisite trial if they had a Medication Level Variability Index (MLVI) ≥2.0, indicating worrisome tacrolimus level fluctuation. The manualized intervention included three weekly phone calls and regular follow-up calls. A comparison group included patients who met enrollment criteria after the subprotocol ended. Outcomes were defined before the intent-to-treat analysis. Feasibility was defined as ≥50% of participants completing the weekly calls. MLVI was compared pre- and 180 days postenrollment and between intervention and comparison groups. Of 18 eligible patients, 15 enrolled. Seven additional patients served as the comparison. Seventy-five percent of participants completed ≥3 weekly calls; average time on protocol was 257.7 days. Average intervention group MLVI was significantly lower (indicating improved blood level stability) at 180 days postenrollment (2.9 ± 1.29) compared with pre-enrollment (4.6 ± 2.10), p = .02. At 180 days, MLVI decreased by 1.6 points in the intervention group but increased by 0.6 in the comparison group (p = .054). Participants successfully engaged in a long-term remote intervention, and their medication blood levels stabilized. NCT02266888. 相似文献
156.
ObjectiveTo assess whether patient socioeconomic status (SES) moderates the effectiveness of coordinated specialty care for first‐episode psychosis and to investigate possible mechanisms.Data SourcesA secondary analysis of data from the RAISE‐ETP Trial, which was conducted from 2010‐2014.Study DesignRAISE‐ETP was a cluster‐randomized trial comparing a coordinated specialty care (CSC) intervention called NAVIGATE with usual community care. We constructed a patient SES index based on parental education, parental occupational prestige, and race/ethnicity. After identifying correlates of SES, we used OLS regression analysis to estimate treatment effects on the major study outcomes across quartiles of the index. We also examined whether correlates of SES including the duration of untreated psychosis (DUP), and participation in NAVIGATE might account for the observed difference in effectiveness of CSC by SES.Principal FindingsThe trial sample had a similar SES distribution to the US population, and SES was positively correlated with all mental health outcomes and several potential moderators at baseline. CSC substantially improved the main trial outcomes compared to community care for patients in the highest SES quartile but had small and statistically insignificant benefits for the remaining 75% of patients. Intervention participation rates and several potential moderators did not explain this disparity.ConclusionsCSC may be more effective for high‐SES patients with early psychosis than low‐SES patients. Additional research is needed to understand why CSC is less effective for low‐SES patients and to develop methods to increase effectiveness for this subgroup. 相似文献
157.
Kali S. Thomas Emily Corneau Courtney H. Van Houtven Portia Cornell David Aron David M. Dosa Susan M. Allen 《Health services research》2021,56(3):389
ObjectiveTo examine characteristics that are associated with receipt of Aid and Attendance (A&A), an enhanced pension benefit for Veterans who qualify on the basis of needing daily assistance, among Veterans who receive pensions.Data sourcesSecondary data analysis of 2016‐2017 national VA administrative data linked with Medicare claims.Study designObservational study examining sociodemographic, medical, and healthcare utilization characteristics associated with receipt of A&A among Veterans receiving pension.Principal findingsIn 2017, 9.7% of Veterans with pension newly received the A&A benefit. The probability of receiving A&A among black and Hispanic pensioners was 4.6 percentage points lower than for white pensioners (95%CI = −0.051, −0.042). Married Veterans receiving pension had a 4.4‐percentage point higher probability of receiving A&A (95%CI = 0.039, 0.048). Most indicators of need for assistance (eg, home health utilization, dementia, stroke) were associated with significantly higher probabilities of receiving A&A, with notable exceptions: pensioners with a diagnosis of Post‐Traumatic Stress Disorder (marginal effect = −0.029 95%CI = −0.037, −0.021) or enrolled in Medicaid (marginal effect = −0.053, 95%CI = −0.057, −0.050) had lower probabilities of receiving A&A. Unadjusted and adjusted rates of receiving A&A among Veterans receiving pension varied by VA medical center.ConclusionsThis study identified potential inequities in receipt of the A&A enhanced pension among a sample of Veterans receiving pension. Increased Veteran outreach, provider education, and VA office coordination can potentially reduce inequities in access to this benefit. 相似文献
158.
Don E. Willis 《Sociology of health & illness》2021,43(1):220-237
A growing but limited body of research has identified the college student population as one that is particularly vulnerable to food insecurity. Early estimates of food insecurity prevalence among college students range from 14 to 60 per cent. The present study utilises original survey data collected from a random sample (n = 300) of college students enrolled at an urban university in the Midwest region of the United States of America (USA). This study examines the impact of food insecurity on health outcomes and the mediation of this relationship by subjective social status among college students. Ordinary least squares (OLS) and logistic regression analyses find that food insecurity is related to worse self-rated, physical and mental health among college students, and Sobel-Goodman tests find that subjective social status plays a significant mediating role in the relationship between food insecurity and health among college students. The implications of these findings in a university context are discussed using a psychosocial framework and insights from the stress process model. In doing so, I discuss food insecurity among college students with an emphasis on the social significance of food and food insecurity. 相似文献
159.