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   4541篇
  免费   372篇
  国内免费   79篇
耳鼻咽喉   71篇
儿科学   12篇
妇产科学   8篇
基础医学   850篇
口腔科学   156篇
临床医学   273篇
内科学   426篇
皮肤病学   11篇
神经病学   938篇
特种医学   166篇
外科学   603篇
综合类   242篇
一般理论   1篇
预防医学   535篇
眼科学   341篇
药学   211篇
中国医学   25篇
肿瘤学   123篇
  2024年   9篇
  2023年   87篇
  2022年   162篇
  2021年   182篇
  2020年   209篇
  2019年   160篇
  2018年   134篇
  2017年   173篇
  2016年   126篇
  2015年   150篇
  2014年   262篇
  2013年   279篇
  2012年   240篇
  2011年   333篇
  2010年   235篇
  2009年   265篇
  2008年   279篇
  2007年   238篇
  2006年   202篇
  2005年   172篇
  2004年   149篇
  2003年   120篇
  2002年   78篇
  2001年   50篇
  2000年   47篇
  1999年   60篇
  1998年   54篇
  1997年   44篇
  1996年   45篇
  1995年   40篇
  1994年   33篇
  1993年   31篇
  1992年   23篇
  1991年   25篇
  1990年   35篇
  1989年   28篇
  1988年   18篇
  1987年   12篇
  1986年   13篇
  1985年   42篇
  1984年   33篇
  1983年   36篇
  1982年   11篇
  1981年   13篇
  1980年   11篇
  1979年   12篇
  1978年   8篇
  1977年   11篇
  1974年   5篇
  1973年   3篇
排序方式: 共有4992条查询结果,搜索用时 78 毫秒
1.
Patient navigation is a strategy for overcoming barriers to reduce disparities and to improve access and outcomes. The aim of this umbrella review was to identify, critically appraise, synthesize, and present the best available evidence to inform policy and planning regarding patient navigation across the cancer continuum. Systematic reviews examining navigation in cancer care were identified in the Cochrane Central Register of Controlled Trials (CENTRAL), PubMed, Embase, Cumulative Index of Nursing and Allied Health (CINAHL), Epistemonikos, and Prospective Register of Systematic Reviews (PROSPERO) databases and in the gray literature from January 1, 2012, to April 19, 2022. Data were screened, extracted, and appraised independently by two authors. The JBI Critical Appraisal Checklist for Systematic Review and Research Syntheses was used for quality appraisal. Emerging literature up to May 25, 2022, was also explored to capture primary research published beyond the coverage of included systematic reviews. Of the 2062 unique records identified, 61 systematic reviews were included. Fifty-four reviews were quantitative or mixed-methods reviews, reporting on the effectiveness of cancer patient navigation, including 12 reviews reporting costs or cost-effectiveness outcomes. Seven qualitative reviews explored navigation needs, barriers, and experiences. In addition, 53 primary studies published since 2021 were included. Patient navigation is effective in improving participation in cancer screening and reducing the time from screening to diagnosis and from diagnosis to treatment initiation. Emerging evidence suggests that patient navigation improves quality of life and patient satisfaction with care in the survivorship phase and reduces hospital readmission in the active treatment and survivorship care phases. Palliative care data were extremely limited. Economic evaluations from the United States suggest the potential cost-effectiveness of navigation in screening programs.  相似文献   
2.
3.
BackgroundFrom birth to young adulthood, health and development of young people are strongly linked to their living situation, including their family’s socioeconomic position (SEP) and living environment. The impact of regional characteristics on development in early childhood beyond family SEP has been rarely investigated. This study aimed to identify regional predictors of global developmental delay at school entry taking family SEP into consideration.MethodWe used representative, population-based data from mandatory school entry examinations of the German federal state of Brandenburg in 2018/2019 with n=22,801 preschool children. By applying binary multilevel models, we hierarchically analyzed the effect of regional deprivation defined by the German Index of Socioeconomic Deprivation (GISD) and rurality operationalized as inverted population density of the children’s school district on global developmental delay (GDD) while adjusting for family SEP (low, medium and high).ResultsFamily SEP was significantly and strongly linked to GDD. Children with the highest family SEP showed a lower odds for GDD compared to a medium SEP (female: OR=4.26, male: OR=3.46) and low SEP (female: OR=16.58, male: OR=12.79). Furthermore, we discovered a smaller, but additional and independent effect of regional socioeconomic deprivation on GDD, with a higher odds for children from a more deprived school district (female: OR=1.35, male: OR=1.20). However, rurality did not show a significant link to GDD in preschool children beyond family SEP and regional deprivation.ConclusionFamily SEP and regional deprivation are risk factors for child development and of particular interest to promote health of children in early childhood and over the life course.  相似文献   
4.
BackgroundUnequal housing access resulted in more than 150 million homeless people worldwide, with millions more expected to be added every year due to the ongoing climate-related crises. Homeless population has a counterproductive effect on the social, psychological integration efforts by the community and exposure to other severe health-related issues. Geographic Information Systems (GIS) have long been applied in urban planning and policy, housing and homelessness, and health-related research.MethodsWe used the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) method to systematically review 24 articles collected from multiple databases (n = 10) that focused on health-related issues among homeless people and used geospatial analysis techniques in their research.ResultsOur findings indicated a geographic clustering of case study locations– 26 out of the 31 case study sites are from the USA and Canada. Studies used spatial analysis techniques to identify hotspots, clusters and patterns of patient location and population distribution. Studies also reported relationships among the location of homeless shelters and substance use, discarded needles, different infectious and non-infectious disease clusters.ConclusionMost studies were restricted in analyzing and visualizing the patterns and disease clusters; however, geospatial analyses techniques are useful and offer diverse techniques for a more sophisticated understanding of the spatial characteristics of the health issues among homeless people. Better integration of GIS in health research among the homeless would help formulate sensible policies to counter health inequities among this vulnerable population group.  相似文献   
5.
6.
This paper compares experiences of breastfeeding outside the home for women living in low-income and high-income neighborhoods of the same city. Our findings are based on an analysis of 22 interviews with breastfeeding mothers (11 in each of two study areas) undertaken in Bristol, UK in 2017. We extend existing scholarship by showing how experiences of breastfeeding vary not only at the regional level but between local areas of the same city, and outline how our findings can inform policy. We advance literature on maternal bodies by exploring how local “landscapes” of breastfeeding emerge as mothers encounter and negotiate different socio-material landscapes and locally-differentiated norms about “appropriate” maternal embodiment. We argue that these variegated interactions can lead to different orientations to space and forms of spatial practice on the part of breastfeeding mothers, as well as different kinds of maternal identities.  相似文献   
7.
In 1993, Rauscher et al. reported a temporary increase in spatial-temporal ability after listening to Mozart's music. This led to numerous replication and extension studies with mixed findings in the past decade. This study investigated the 'Mozart effect' in preschool children. Forty-one boys and girls, aged three to five, attempted a series of pencil-and-paper maze tests after each of three listening conditions: Mozart's Piano Concerto in A Major (K488), age-appropriate popular music and silence. Overall, there were no statistically significant differences among the three interventions. The results are discussed in relation to the findings of other investigations of the Mozart effect, and the need for further investigation of possible trends.  相似文献   
8.
The aim of this series of experiments was to determine whether attention is normally required for continuously processing vestibular information concerning orientation, or is required only when orientation is disrupted (eg by vestibular dysfunction or by conflicting visual and vestibular orientation cues). In the first two studies, healthy subjects were passively oscillated, and indicated when they perceived they were passing through their starting position. There was only weak evidence for interference between performance on this 'continuous orientation monitoring task' and on concurrent mental tasks. However, a third study showed that when patients with vestibular imbalance carried out the continuous orientation monitoring task their performance on a concurrent mental arithmetic task was substantially impaired. This dual task interference was correlated with inaccuracy in judging orientation on the continuous orientation monitoring task, which in turn correlated with severity of recent vestibular symptomatology (assessed by questionnaire). In a fourth experiment, disorientation was induced in healthy subjects by rotating the visual field about the line of sight. Bidirectional interference was observed between monitoring orientation (assessed by accuracy in setting a rod to the perceived vertical) and performance of an arithmetic task. Dual task interference was correlated with baseline levels of disorientation induced by the visual field, as indicated by inaccuracy in judging the visual vertical. These findings suggest that monitoring orientation makes significant demands upon cortical processing resources when disorientation is induced, whether the disorientation results from deficient sensory functioning or from ambiguous perceptual information.  相似文献   
9.
We previously reported that lymphatic mapping using isosulfan blue can be used to identify sentinel nodes (SNs). This study was undertaken to evaluate the feasibility of using the SN technique in treating early gastric cancer and to explore its usefulness for minimal invasive surgery. Twenty-three patients with early gastric cancer who underwent SN biopsy were retrospectively evaluated. Based on SN evaluation, individualized surgery was performed in five patients with T1N0M0 gastric cancer. When pathological examination of frozen sections revealed metastasis in SNs, we performed a standard D2 gastrectomy. Laparoscopic local resection was applied when the SN biopsy was negative. Our results showed that the success rate with SN biopsy in early gastric cancer was 100%, as were the accuracy, sensitivity, and specificity. All five patients with early gastric cancer had SNs negative for metastases both by frozen section and by postoperative pathology. Thus, all these patients underwent laparoscopic local resection without extended lymphadenectomy. We conclude that SN biopsy is a useful tool to individualize the operative procedure, and laparoscopic local resection can be safely performed using SN guidance in selected patients with early gastric cancer.  相似文献   
10.
X线透视导航下动力髋(髁)螺钉治疗股骨转子间骨折   总被引:16,自引:10,他引:6  
目的探讨X线透视导航技术在动力髋(髁)螺钉系统治疗股骨转子间骨折中的临床应用。方法应用连接在标准动力髋(髁)器械上的适配器,X线透视导航辅助完成术中松质骨拉力螺钉在股骨颈通道内的入点选择及拉力螺钉的置入。结果8例股骨转子间骨折的应用结果令人满意。手术时间平均为48.8min,X线图像采集平均3.4次。术中和术后无并发症发生。结论肯定了X线透视导航技术在动力髋(髁)螺钉系统治疗股骨转子间骨折中应用的可行性。术中只需1次X线成像就能做出虚拟的手术环境和路径;导航的瞬时追踪功能使术者能实时监测,减少了X线辐射量,缩短了手术时间,提高了拉力螺钉置入的准确度,减小了手术创伤。  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