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   2338062篇
  免费   175077篇
  国内免费   3293篇
耳鼻咽喉   32051篇
儿科学   75796篇
妇产科学   62724篇
基础医学   347179篇
口腔科学   63601篇
临床医学   210239篇
内科学   454076篇
皮肤病学   51717篇
神经病学   184622篇
特种医学   87981篇
外国民族医学   489篇
外科学   353479篇
综合类   47319篇
现状与发展   12篇
一般理论   849篇
预防医学   181750篇
眼科学   54177篇
药学   174992篇
  9篇
中国医学   4536篇
肿瘤学   128834篇
  2021年   18348篇
  2019年   19569篇
  2018年   27106篇
  2017年   20393篇
  2016年   22790篇
  2015年   25693篇
  2014年   36161篇
  2013年   54055篇
  2012年   74809篇
  2011年   79526篇
  2010年   47136篇
  2009年   44630篇
  2008年   74735篇
  2007年   79610篇
  2006年   80452篇
  2005年   77884篇
  2004年   74468篇
  2003年   71782篇
  2002年   69455篇
  2001年   108774篇
  2000年   111490篇
  1999年   93552篇
  1998年   27016篇
  1997年   23564篇
  1996年   22362篇
  1995年   22569篇
  1994年   20777篇
  1993年   19604篇
  1992年   71900篇
  1991年   70077篇
  1990年   68379篇
  1989年   65651篇
  1988年   60263篇
  1987年   59101篇
  1986年   55194篇
  1985年   52988篇
  1984年   39244篇
  1983年   33308篇
  1982年   19768篇
  1979年   35796篇
  1978年   25582篇
  1977年   21139篇
  1976年   20260篇
  1975年   21756篇
  1974年   26103篇
  1973年   24767篇
  1972年   23183篇
  1971年   22016篇
  1970年   20220篇
  1969年   19290篇
排序方式: 共有10000条查询结果,搜索用时 262 毫秒
21.
Gestational trophoblastic neoplasia (GTN) patients are treated according to the eight-variable International Federation of Gynaecology and Obstetrics (FIGO) scoring system, that aims to predict first-line single-agent chemotherapy resistance. FIGO is imperfect with one-third of low-risk patients developing disease resistance to first-line single-agent chemotherapy. We aimed to generate simplified models that improve upon FIGO. Logistic regression (LR) and multilayer perceptron (MLP) modelling (n = 4191) generated six models (M1-6). M1, all eight FIGO variables (scored data); M2, all eight FIGO variables (scored and raw data); M3, nonimaging variables (scored data); M4, nonimaging variables (scored and raw data); M5, imaging variables (scored data); and M6, pretreatment hCG (raw data) + imaging variables (scored data). Performance was compared to FIGO using true and false positive rates, positive and negative predictive values, diagnostic odds ratio, receiver operating characteristic (ROC) curves, Bland-Altman calibration plots, decision curve analysis and contingency tables. M1-6 were calibrated and outperformed FIGO on true positive rate and positive predictive value. Using LR and MLP, M1, M2 and M4 generated small improvements to the ROC curve and decision curve analysis. M3, M5 and M6 matched FIGO or performed less well. Compared to FIGO, most (excluding LR M4 and MLP M5) had significant discordance in patient classification (McNemar's test P < .05); 55-112 undertreated, 46-206 overtreated. Statistical modelling yielded only small gains over FIGO performance, arising through recategorisation of treatment-resistant patients, with a significant proportion of under/overtreatment as the available data have been used a priori to allocate primary chemotherapy. Streamlining FIGO should now be the focus.  相似文献   
22.
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   
23.
24.
25.
Maternal and Child Health Journal - Early life exposures can have an impact on a child’s developmental trajectory and children born late preterm (34–36&nbsp;weeks gestational age)...  相似文献   
26.
Troppmair  Teresa  Egger  J.  Krösbacher  A.  Zanvettor  A.  Schinnerl  A.  Neumayr  A.  Baubin  M. 《Der Anaesthesist》2022,71(4):272-280
Die Anaesthesiologie - Die Qualität eines Rettungssystems zeichnet sich auch durch den effizienten Einsatz seiner personellen und Fahrzeugressourcen aus. So können im berechtigten Fall...  相似文献   
27.
28.
29.
30.
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