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   6064篇
  免费   366篇
  国内免费   23篇
耳鼻咽喉   58篇
儿科学   144篇
妇产科学   90篇
基础医学   1023篇
口腔科学   476篇
临床医学   410篇
内科学   1317篇
皮肤病学   196篇
神经病学   510篇
特种医学   72篇
外科学   551篇
综合类   21篇
一般理论   1篇
预防医学   471篇
眼科学   118篇
药学   462篇
中国医学   35篇
肿瘤学   498篇
  2023年   66篇
  2022年   31篇
  2021年   206篇
  2020年   155篇
  2019年   194篇
  2018年   203篇
  2017年   173篇
  2016年   169篇
  2015年   213篇
  2014年   264篇
  2013年   336篇
  2012年   494篇
  2011年   577篇
  2010年   330篇
  2009年   259篇
  2008年   427篇
  2007年   397篇
  2006年   338篇
  2005年   347篇
  2004年   317篇
  2003年   268篇
  2002年   214篇
  2001年   57篇
  2000年   48篇
  1999年   73篇
  1998年   40篇
  1997年   22篇
  1996年   20篇
  1995年   22篇
  1994年   15篇
  1993年   14篇
  1992年   19篇
  1991年   21篇
  1990年   26篇
  1989年   16篇
  1988年   15篇
  1987年   4篇
  1985年   10篇
  1984年   11篇
  1983年   10篇
  1982年   6篇
  1980年   2篇
  1979年   6篇
  1977年   4篇
  1976年   3篇
  1974年   3篇
  1973年   1篇
  1970年   1篇
  1966年   1篇
  1965年   1篇
排序方式: 共有6453条查询结果,搜索用时 18 毫秒
1.
2.
3.
4.
5.
The efficacy of azacitidine (AZA) on survival of lower risk (LR) ‐ myelodysplastic syndromes (MDS) is controversial. To address this issue, we retrospectively evaluated the long‐term survival benefit of AZA for patients with LR‐MDS defined by International Prognostic Scoring System (IPSS). Using data from 489 patients with LR‐MDS in Nagasaki, hematologic responses according to International Working Group 2006 and overall survival (OS) were compared among patients that received best supportive care (BSC), immunosuppressive therapy (IST), erythropoiesis‐stimulating agents (ESA), and AZA. Patients treated with AZA showed complete remission (CR) rate at 11.3%, marrow CR at 1.9%, and any hematologic improvement at 34.0%, with transfusion independence (TI) of red blood cells in 27.3% of patients. and platelet in 20% of patients, respectively. Median OS for patients received IST, ESA, BSC, and AZA (not reached, 91 months, 58 months, and 29 months, respectively) differed significantly (P < .001). Infection‐related severe adverse events were observed in more than 20% of patients treated with AZA. Multivariate analysis showed age, sex, IPSS score at diagnosis, and transfusion dependence were significant for OS, but AZA treatment was not, which maintained even response to AZA, and IPSS risk status at AZA administration was added as factors. We could not find significant survival benefit of AZA treatment for LR‐MDS patients.  相似文献   
6.
7.
BackgroundAccumulating evidence suggests that deficits in decision-making and judgment may be involved in several psychiatric disorders, including addiction. Behavioral addiction is a conceptually new psychiatric condition, raising a debate of what criteria define behavioral addiction, and several impulse control disorders are equivalently considered as types of behavioral addiction. In this preliminary study with a relatively small sample size, we investigated how decision-making and judgment were compromised in behavioral addiction to further characterize this psychiatric condition.MethodHealthy control subjects (n = 31) and patients with kleptomania and paraphilia as behavioral addictions (n = 16) were recruited. A battery of questionnaires for assessments of cognitive biases and economic decision-making were conducted, as was a psychological test for the assessment of the jumping-to-conclusions bias, using functional near-infrared spectroscopy recordings of prefrontal cortical (PFC) activity.ResultsAlthough behavioral addicts exhibited stronger cognitive biases than controls in the questionnaire, the difference was primarily due to lower intelligence in the patients. Behavioral addicts also exhibited higher risk taking and worse performance in economic decision-making, indicating compromised probability judgment, along with diminished PFC activity in the right hemisphere.ConclusionOur study suggests that behavioral addiction may involve impairments of probability judgment associated with attenuated PFC activity, which consequently leads to higher risk taking in decision-making.  相似文献   
8.
Data on risky sexual behaviors in people living with HIV/AIDS (PLWHA) is still scarce in some populations around the world. The purpose of this study was to assess the factors associated with the use of condoms in a representative sample of PLWHA in outpatient treatment in the city of São Paulo. Six hundred and sixty-seven HIV-positive patients (383 men and 284 women) who were being treated at eight centers participated in this study. Data were collected using a sociodemographic survey, the Beck depression and anxiety inventories, a survey of alcohol and other drugs use, the Alcohol Use Disorders Identification Test, a sexual behavior survey, and the Sexual Risk Behavior Assessment Schedule. The majority of study participants were sexually active (almost 62% of the sample had at least one sexual partner in the last three months), and at least one-fourth engaged in unsafe sex (25.3% did not use condoms during at least one instance of anal and/or vaginal intercourse in the past three months). Multivariate logistic regression showed that engaging in unprotected sex was more likely among females (p < .001), persons with an HIV-positive partner (p < .001), and people using cannabis before sex (p = .002). These findings should stimulate health-care workers to create specific groups for women, seroconcordant couples, and cannabis users to discuss condom use, as they seem to be vulnerable groups.  相似文献   
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