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   1321006篇
  免费   96642篇
  国内免费   2083篇
耳鼻咽喉   18629篇
儿科学   43948篇
妇产科学   39016篇
基础医学   192477篇
口腔科学   35783篇
临床医学   113973篇
内科学   259419篇
皮肤病学   27405篇
神经病学   103707篇
特种医学   50860篇
外国民族医学   366篇
外科学   202309篇
综合类   26883篇
现状与发展   2篇
一般理论   386篇
预防医学   99160篇
眼科学   29832篇
药学   100884篇
  1篇
中国医学   2540篇
肿瘤学   72151篇
  2018年   13527篇
  2016年   11475篇
  2015年   13085篇
  2014年   18052篇
  2013年   27089篇
  2012年   37559篇
  2011年   39886篇
  2010年   23385篇
  2009年   21826篇
  2008年   38124篇
  2007年   41043篇
  2006年   41373篇
  2005年   40496篇
  2004年   38705篇
  2003年   37323篇
  2002年   36660篇
  2001年   58308篇
  2000年   59737篇
  1999年   50899篇
  1998年   14513篇
  1997年   13014篇
  1996年   13243篇
  1995年   12499篇
  1994年   11872篇
  1993年   10958篇
  1992年   41060篇
  1991年   40421篇
  1990年   39953篇
  1989年   38770篇
  1988年   36149篇
  1987年   35389篇
  1986年   33757篇
  1985年   32169篇
  1984年   23969篇
  1983年   20864篇
  1982年   12395篇
  1981年   10951篇
  1979年   22653篇
  1978年   15899篇
  1977年   13745篇
  1976年   12984篇
  1975年   14219篇
  1974年   16686篇
  1973年   16097篇
  1972年   15337篇
  1971年   14245篇
  1970年   13226篇
  1969年   12740篇
  1968年   11981篇
  1967年   10486篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
2.
ABSTRACT

The lack of stable housing can impair access and continuity of care for patients living with human immunodeficiency virus (HIV). This study investigated the relationship between housing status assessed at multiple time points and several core HIV-related outcomes within the same group of HIV patients experiencing homelessness. Patients with consistently stable housing (CSH) during the year were compared to patients who lacked CSH (non-CSH group). The study outcomes included HIV viral load (VL), CD4 counts, and health care utilization. Multivariable and propensity weighted analyses were used to assess outcomes adjusting for potential group differences. Of 208 patients, 88 (42%) had CSH and 120 (58%) were non-CSH. Patients with CSH had significantly higher proportion of VL suppression and higher mean CD4 counts. The frequency of nurse visits in the CSH group was less than a half of that in the non-CSH group. Patients with CSH were less likely to be admitted to the medical respite facility, and if admitted, their length of stay was about a half of that for the non-CSH group. Our study findings show that patients with CSH had significantly better HIV virologic control and immune status as well as improved health care utilization.  相似文献   
3.
4.
5.
6.
Vaccination is a vital health care initiative to prevent individual and population infection. To increase vaccination rates the federal government implemented the ‘No Jab, No Pay’ policy, where eligibility for several government benefits required children to be fully vaccinated by removing ‘conscientious objections’ and expanding the age range of children whose families receive benefits. This study assesses the impact of this policy at a local area within a single medical practice community in NSW, Australia. A retrospective clinical audit was performed between 2012 and 2017 on a single general practice's vaccination records for children ≤19 years. Catch-up vaccinations were assessed based on age at vaccination. Incidence of catch-up vaccinations was assessed for each of four years before and two years after the implementation of the ‘No Jab, No Pay’ policy in January 2016, along with the age of children and vaccination(s) given. Catch-up vaccinations were assessed temporally either side of implementation of ‘No Jab, No Pay’. Comparing the average annual vaccination catch-up incidence rate of 6.2% pre-implementation (2012–2015), there was an increase to 9.2% in 2016 (p < .001) and 7.8% in 2017 (p = .027). Secondary outcome measurement of catch-up vaccination incidence rates before (2012–2015) and after (2016–2017) ‘No Jab, No Pay’ implementation showed statistically significant increases for children aged 8–11 years (3.2%–5.6%, p = .038), 12–15 years (7.5%–14.7%, p < .001) and 16–19 years (3.3%–10.2%, p < .001) along with a statistically significant reduction in children aged 1–3 years (11.4%–6.2%, p = .015). Also, catch-up rates for DTPa significantly increased after program implementation. This study demonstrates that the Australian federal government vaccination policy ‘No Jab, No Pay’ was coincident with an increase in catch-up vaccinations within a rural NSW community served by one medical practice, especially for older children.  相似文献   
7.
BackgroundLittle is known about the extent of ordering low-value services by.PurposeTo compare the rates of low-value back images ordered by primary care physicians (PCMDs) and primary care nurse practitioners (PCNPs).MethodWe used 2012 and 2013 Medicare Part B claims for all beneficiaries in 18 hospital referral ?regions (HRRs) and a measure of low-value back imaging from Choosing Wisely. Models included random clinician effect and fixed effects for beneficiary age, disability, Elixhauser comorbidities, clinician sex, the emergency department setting, back pain visit volume, organization, and region (HRR).FindingsPCNPs (N = 231) and PCMDs (N = 4,779) order low-value back images at similar rates (NP: all images: 26.5%; MRI/CT: 8.4%; MD: all images: 24.5%; MRI/CT: 7.7%), with no detectable significant difference when controlling for covariates.DiscussionPCNPs and PCMDs order low-value back images at an effectively similar rate.  相似文献   
8.
9.
10.
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