首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   14251篇
  免费   1282篇
  国内免费   244篇
耳鼻咽喉   61篇
儿科学   222篇
妇产科学   232篇
基础医学   444篇
口腔科学   184篇
临床医学   1926篇
内科学   1455篇
皮肤病学   54篇
神经病学   465篇
特种医学   161篇
外国民族医学   1篇
外科学   921篇
综合类   1257篇
现状与发展   1篇
一般理论   11篇
预防医学   4339篇
眼科学   109篇
药学   3021篇
  10篇
中国医学   497篇
肿瘤学   406篇
  2023年   309篇
  2022年   297篇
  2021年   671篇
  2020年   661篇
  2019年   634篇
  2018年   613篇
  2017年   630篇
  2016年   544篇
  2015年   524篇
  2014年   886篇
  2013年   1202篇
  2012年   802篇
  2011年   863篇
  2010年   692篇
  2009年   693篇
  2008年   691篇
  2007年   699篇
  2006年   543篇
  2005年   466篇
  2004年   403篇
  2003年   392篇
  2002年   313篇
  2001年   269篇
  2000年   216篇
  1999年   168篇
  1998年   147篇
  1997年   146篇
  1996年   117篇
  1995年   125篇
  1994年   120篇
  1993年   69篇
  1992年   91篇
  1991年   72篇
  1990年   72篇
  1989年   51篇
  1988年   46篇
  1987年   38篇
  1986年   58篇
  1985年   63篇
  1984年   68篇
  1983年   31篇
  1982年   44篇
  1981年   40篇
  1980年   32篇
  1979年   23篇
  1978年   26篇
  1977年   27篇
  1976年   29篇
  1975年   16篇
  1974年   14篇
排序方式: 共有10000条查询结果,搜索用时 19 毫秒
41.
BackgroundDischarge against medical advice (AMA) is an important, yet understudied, aspect of health care—particularly in trauma populations. AMA discharges result in increased mortality, increased readmission rates, and higher health care costs.ObjectiveThe goal of this analysis was to determine what factors impact a patient's odds of leaving the hospital prior to treatment.MethodsWe performed a retrospective analysis of the National Trauma Data Bank on adult trauma patients (older than 14 years) from 2013 to 2015. Of the 1,770,570 patients with known disposition, excluding mortality, 24,191 patients (1.4%) left AMA. We ascertained patient characteristics including age, sex, race, ethnicity, insurance status, ETOH, drug use, geographic location, Injury Severity Score (ISS), injury mechanism, and anatomic injury location. Multivariate logistic regression models were used to determine which patient factors were associated with AMA status.ResultsUninsured (odds ratio [OR] 2.72; 95% confidence interval [CI] 2.58–2.86) or Medicaid-insured (OR 2.50; 95% CI 2.37–2.63) trauma patients were significantly more likely to leave AMA than patients with private insurance. Compared to white patients, African-American patients (OR 1.06; 95% CI 1.02–1.11) were more likely, and Native-American (OR 0.62; 95% CI 0.52–0.75), Asian (OR 0.59; 95% CI 0.49–0.69), and Hispanic (OR 0.80; 95% CI 0.75–0.85) patients were less likely, to leave AMA when controlling for age, sex, ISS, and type of injury.ConclusionsInsurance status, race, and ethnicity are associated with a patient's decision to leave AMA. Uninsured and Medicaid patients have more than twice the odds of leaving AMA. These findings demonstrate that racial and socioeconomic disparities are important targets for future efforts to reduce AMA rates and improve outcomes from blunt and penetrating trauma.  相似文献   
42.
43.
Abstract

We highlight the critical roles that pharmacists have related to sustaining and advancing the changes being made in the face of the current COVID-19 pandemic to ensure that patients have more seamless and less complex access to treatment. Discussed herein is how the current COVID-19 pandemic is impacting persons with substance use disorders, barriers that persist, and the opportunities that arise as regulations around treatments for this population are eased.  相似文献   
44.
Neuroinflammation triggered by the expression of damaged-associated molecular patterns released from dying cells plays a critical role in the pathogenesis of ischemic stroke. However, the benefits from the control of neuroinflammation in the clinical outcome have not been established. In this study, the effectiveness of intranasal, a highly efficient route to reach the central nervous system, and intraperitoneal dexamethasone administration in the treatment of neuroinflammation was evaluated in a 60-min middle cerebral artery occlusion (MCAO) model in C57BL/6 male mice. We performed a side-by-side comparison using intranasal versus intraperitoneal dexamethasone, a timecourse including immediate (0 h) or 4 or 12 h poststroke intranasal administration, as well as 4 intranasal doses of dexamethasone beginning 12 h after the MCAO versus a single dose at 12 h to identify the most effective conditions to treat neuroinflammation in MCAO mice. The best results were obtained 12 h after MCAO and when mice received a single dose of dexamethasone (0.25 mg/kg) intranasally. This treatment significantly reduced mortality, neurological deficits, infarct volume size, blood–brain barrier permeability in the somatosensory cortex, inflammatory cell infiltration, and glial activation. Our results demonstrate that a single low dose of intranasal dexamethasone has neuroprotective therapeutic effects in the MCAO model, showing a better clinical outcome than the intraperitoneal administration. Based on these results, we propose a new therapeutic approach for the treatment of the damage process that accompanies ischemic stroke.Electronic supplementary materialThe online version of this article (10.1007/s13311-020-00884-9) contains supplementary material, which is available to authorized users.  相似文献   
45.
Previous studies on changes in health policies theorize such changes either as crises responses, or as the outcome of longer-term stakeholder conflicts. In this paper, we propose that parliaments function as overlooked, intermediate actors that contribute to translating the interests of stakeholders into policy changes. We study the role of parliament connecting policy makers and stakeholders in the context of drug regulation. Based on three high-profile cases of drug withdrawals between 1991 and 2005 in the United Kingdom (triazolam, rofecoxib, and co-proxamol), we distinguish partisan-political, individual-idiosyncratic, and collective-institutional pathways of parliamentary action on drug withdrawals. Distinguishing direct and indirect actions, we argue that indirect courses of action, including advocacy and educational work, can be just as effective as regular legislative endeavours, under certain conditions.  相似文献   
46.
Split liver transplantation (SLT) is 1 strategy for maximizing the number of deceased donor liver transplants. Recent reports suggest that utilization of SLT in the United States remains low. We examined deceased donor offers that were ultimately split between 2010 and 2014. SLTs were categorized as “primary” and “secondary” transplants. We analyzed allocation patterns and used logistic regression to evaluate factors associated with secondary split discard. Four hundred eighteen livers were split: 54% from adult, 46% from pediatric donors. Of the 227 adult donor livers split, 61% met United Network for Organ Sharing “optimal” split criteria. A total of 770 recipients (418 primary and 352 secondary) were transplanted, indicating 16% discard. Ninety‐two percent of the 418 primary recipients were children, and 47% were accepted on the first offer. Eighty‐seven percent of the 352 secondary recipients were adults, and 7% were accepted on the first offer. Of the 352 pairs, 99% were transplanted in the same region, 36% at the same center. In logistic regression, shorter donor height was associated with secondary discard (odds ratio 0.97 per cm, 95% CI 0.94‐1.00, P = .02). SLT volume by center was not predictive of secondary discard. Current policy proposals that incentivize SLT in the United States could increase the number of transplants to children and adults.  相似文献   
47.
48.
Continuous management improvement should be an aspiration for all public sector organizations. External comparison or benchmarking identifies good practices in similar organizations. For public health services, it is not easy to obtain such indicators. The objectives of this paper are to describe the process of conducting a benchmarking exercise for a public health agency, and to share its results. For this purpose, agencies that may be compared were identified, and their websites were searched for annual reports or other documents with indicators of the activities or results of public health services. Limitations and contextual aspects of the indicators of the different organizations were identified, as well as ways to improve their comparability. Finally, a set of 19 indicators is proposed, as an initial core for quality management comparisons.  相似文献   
49.
ObjectivesNursing homes became epicenters of COVID-19 in the spring of 2020. Due to the substantial case fatality rates within congregate settings, federal agencies recommended restrictions to family visits. Six months into the COVID-19 pandemic, these largely remain in place. The objective of this study was to generate consensus guidance statements focusing on essential family caregivers and visitors.DesignA modified 2-step Delphi process was used to generate consensus statements.Setting and ParticipantsThe Delphi panel consisted of 21 US and Canadian post-acute and long-term care experts in clinical medicine, administration, and patient care advocacy.MethodsState and federal reopening statements were collected in June 2020 and the panel voted on these using a 3-point Likert scale with consensus defined as ≥80% of panel members voting “Agree.” The consensus statements then informed development of the visitor guidance statements.ResultsThe Delphi process yielded 77 consensus statements. Regarding visitor guidance, the panel made 5 strong recommendations: (1) maintain strong infection prevention and control precautions, (2) facilitate indoor and outdoor visits, (3) allow limited physical contact with appropriate precautions, (4) assess individual residents' care preferences and level of risk tolerance, and (5) dedicate an essential caregiver and extend the definition of compassionate care visits to include care that promotes psychosocial well-being of residents.Conclusions and ImplicationsThe COVID-19 pandemic has seen substantial regulatory changes without strong consideration of the impact on residents. In the absence of timely and rigorous research, the involvement of clinicians and patient care advocates is important to help create the balance between individual resident preferences and the health of the collective. The results of this evidence-based Delphi process will help guide policy decisions as well as inform future research.  相似文献   
50.
BackgroundService animals are an invaluable resource to improving health among individuals with disabilities, and their use is steadily growing. Yet, United States’ current federal and state policies surrounding service animals are contradictory and burdensome, and often do not adequately protect the rights of service animal handlers.ObjectiveTo review each state’s service animal policies surrounding criminal interference, misrepresentation of a service animal, and public accessibility. To also identify inconsistencies among states’ individual policies, between state policies, and between state and federal policies, and discuss the implications of these inconsistencies.MethodsWestlaw legal research database was used to comprehensively review each state’s policies regarding the use of a service animal.Results26 states have one or more policies that are incongruous with the Americans with Disabilities Act. Further, 34 states have contradictions within their own policies and between other states. 31 states provide protections against fraudulent service animals, and there are variations in the degree of protection and ability to enforce these laws.ConclusionsBecause service animals are a vital resource to this particularly vulnerable population, it is imperative that our policies encourage their use and protect the rights of handlers. Yet, inconsistencies among current policies create confusion and ultimately deter individuals with disabilities from taking full advantage of their service animal. We are in need of clear, cohesive policy at all levels of government in order to improve health literacy and ensure that those with disabilities are able to benefit from the positive health impacts of a service animal.  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号