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   333108篇
  免费   12609篇
  国内免费   1170篇
耳鼻咽喉   4293篇
儿科学   11747篇
妇产科学   9089篇
基础医学   44839篇
口腔科学   11564篇
临床医学   27815篇
内科学   66049篇
皮肤病学   8054篇
神经病学   25266篇
特种医学   13863篇
外国民族医学   99篇
外科学   42361篇
综合类   1704篇
一般理论   61篇
预防医学   29876篇
眼科学   6737篇
药学   23278篇
  2篇
中国医学   771篇
肿瘤学   19419篇
  2023年   1415篇
  2022年   3012篇
  2021年   5158篇
  2020年   3209篇
  2019年   4391篇
  2018年   8334篇
  2017年   7354篇
  2016年   7110篇
  2015年   8871篇
  2014年   9823篇
  2013年   10833篇
  2012年   20954篇
  2011年   16767篇
  2010年   8684篇
  2009年   9152篇
  2008年   11563篇
  2007年   12171篇
  2006年   11642篇
  2005年   19063篇
  2004年   19824篇
  2003年   14630篇
  2002年   9338篇
  2001年   5570篇
  2000年   2853篇
  1999年   6900篇
  1998年   1550篇
  1992年   7276篇
  1991年   7397篇
  1990年   7648篇
  1989年   7205篇
  1988年   6710篇
  1987年   6449篇
  1986年   6179篇
  1985年   5428篇
  1984年   3811篇
  1983年   3095篇
  1979年   3939篇
  1978年   2471篇
  1977年   1883篇
  1976年   1641篇
  1975年   2547篇
  1974年   3180篇
  1973年   2786篇
  1972年   2816篇
  1971年   2796篇
  1970年   2601篇
  1969年   2499篇
  1968年   2262篇
  1967年   2199篇
  1966年   1923篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
81.
82.
Traditionally, major complications and unanticipated admission/readmission rates were used to assess outcome after day surgery. However, in view of the relative absence of major complications the quality of recovery (QOR) should be considered one of the principal endpoints after day surgery. In our study, the level of QOR is defined by a combination of the Global Surgical Recovery (GSR) Index and the Quality of Life (QOL).The aim of this study was to analyze prevalence and predictors of QOR after day surgery on the fourth postoperative day.Elective patients scheduled for day surgery from November 2008 to April 2010 were enrolled in a prospective cohort study. Outcome parameters were measured by using questionnaire packages at 2 time points: 1 week preoperatively and 4 days postoperatively. Primary outcome parameter is the QOR and is defined as good if the GSR index >80% as well as the postoperative QOL is unchanged or improved as compared with baseline. QOR is defined as poor if both the GSR index ≤80% and if the postoperative QOL is decreased as compared with baseline. QOR is defined as intermediate in all other cases. Three logistic regression analyses were performed to determine predictors for poor QOR after day surgery.A total of 1118 patients were included. A good QOR was noted in 17.3% of patients, an intermediate QOR in 34.8%, and a poor QOR in 47.8% 4 days after day surgery. The best predictor for poor QOR after day surgery was type of surgery. Other predictors were younger age, work status, and longer duration of surgery. A history of previous surgery, expected pain (by the patient) and high long-term surgical fear were significant predictors of poor QOR in only 1 of 3 prediction models.The QOR at home 4 days after day surgery was poor in the majority of patients and showed a significant procedure-specific variation. Patients at risk for poor QOR can be identified during the preoperative period based on type of surgery, age, work status, and the duration of the surgery.  相似文献   
83.
IntroductionScales for predicting venous thromboembolism (VTE) recurrence are useful for deciding the duration of the anticoagulant treatment. Although there are several scales, the most appropriate for our setting has not been identified. For this reason, we aimed to validate the DASH prediction score and the Vienna nomogram at 12 months.MethodsThis was a retrospective study of unselected consecutive VTE patients seen between 2006 and 2014. We compared the ability of the DASH score and the Vienna nomogram to predict recurrences of VTE. The validation was performed by stratifying patients as low-risk or high-risk, according to each scale (discrimination) and comparing the observed recurrence with the expected rate (calibration).ResultsOf 353 patients evaluated, 195 were analyzed, with an average age of 53.5 ± 19 years. There were 21 recurrences in 1 year (10.8%, 95% CI: 6.8%-16%). According to the DASH score, 42% were classified as low risk, and the rate of VTE recurrence in this group was 4.9% (95% CI: 1.3%-12%) vs. the high-risk group that was 15% (95% CI: 9%-23%) (p <.05). According to the Vienna nomogram, 30% were classified as low risk, and the rate of VTE recurrence in the low risk group vs. the high risk group was 4.2% (95% CI:0.5%-14%) vs. 16.2% (95% CI: 9.9%-24.4%) (p <.05).ConclusionsOur study validates the DASH score and the Vienna nomogram in our population. The DASH prediction score may be the most advisable, both because of its simplicity and its ability to identify more low-risk patients than the Vienna nomogram (42% vs. 30%).  相似文献   
84.
Infantile hemangiomas (IHs) are the most common benign tumor of infancy, characterized by a natural history of early proliferation in the first months of life to eventual involution during childhood, often with residual fibrofatty tissue. Once involution has been achieved, IHs do not typically recur. We present two cases of exogenous growth hormone therapy resulting in the recurrence of IHs in late childhood, supported by radiological, immunohistochemical, in vitro, and in vivo evidence.  相似文献   
85.
86.
87.
88.
89.
90.
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