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   2210篇
  免费   133篇
  国内免费   24篇
耳鼻咽喉   36篇
儿科学   100篇
妇产科学   87篇
基础医学   231篇
口腔科学   49篇
临床医学   171篇
内科学   589篇
皮肤病学   107篇
神经病学   150篇
特种医学   87篇
外国民族医学   1篇
外科学   347篇
综合类   21篇
预防医学   153篇
眼科学   26篇
药学   95篇
中国医学   8篇
肿瘤学   109篇
  2023年   12篇
  2022年   24篇
  2021年   47篇
  2020年   35篇
  2019年   50篇
  2018年   64篇
  2017年   45篇
  2016年   44篇
  2015年   52篇
  2014年   70篇
  2013年   96篇
  2012年   142篇
  2011年   122篇
  2010年   81篇
  2009年   98篇
  2008年   102篇
  2007年   106篇
  2006年   91篇
  2005年   94篇
  2004年   114篇
  2003年   96篇
  2002年   83篇
  2001年   54篇
  2000年   96篇
  1999年   68篇
  1998年   36篇
  1997年   35篇
  1996年   36篇
  1995年   27篇
  1994年   31篇
  1993年   12篇
  1992年   34篇
  1991年   33篇
  1990年   18篇
  1989年   15篇
  1988年   23篇
  1987年   17篇
  1986年   21篇
  1985年   15篇
  1984年   13篇
  1983年   9篇
  1982年   15篇
  1981年   8篇
  1979年   7篇
  1978年   8篇
  1977年   7篇
  1976年   7篇
  1975年   8篇
  1974年   7篇
  1971年   8篇
排序方式: 共有2367条查询结果,搜索用时 0 毫秒
881.
Raised intraocular pressure (IOP) is the most important risk factor for developing glaucoma, the second commonest cause of blindness globally. Understanding associations with IOP and variations in IOP between countries may teach us about mechanisms underlying glaucoma. We examined cross-sectional associations with IOP in 43,500 European adults from 12 cohort studies belonging to the European Eye Epidemiology (E3) consortium. Each study conducted multivariable linear regression with IOP as the outcome variable and results were pooled using random effects meta-analysis. The association of standardized study IOP with latitude was tested using meta-regression. Higher IOP was observed in men (0.18 mmHg; 95 % CI 0.06, 0.31; P = 0.004) and with higher body mass index (0.21 mmHg per 5 kg/m2; 95 % CI 0.14, 0.28; P < 0.001), shorter height (?0.17 mmHg per 10 cm; 95 % CI –0.25, ?0.08; P < 0.001), higher systolic blood pressure (0.17 mmHg per 10 mmHg; 95 % CI 0.12, 0.22; P < 0.001) and more myopic refraction (0.06 mmHg per Dioptre; 95 % CI 0.03, 0.09; P < 0.001). An inverted U-shaped trend was observed between age and IOP, with IOP increasing up to the age of 60 and decreasing in participants older than 70 years. We found no significant association between standardized IOP and study location latitude (P = 0.76). Novel findings of our study include the association of lower IOP in taller people and an inverted-U shaped association of IOP with age. We found no evidence of significant variation in IOP across Europe. Despite the limited range of latitude amongst included studies, this finding is in favour of collaborative pooling of data from studies examining environmental and genetic determinants of IOP in Europeans.  相似文献   
882.
883.
884.
885.
(18)F-FDG PET-CT has become an essential tool in oncology patient management. The normal distribution of the FDG and the possible artifacts (pitfalls), including those from CT-based attenuation correction, have already been described in several reviews. However, only a few cases of FDG focal lung uptake have been reported recently. We present two cases of oncology patients during a routine follow-up with this type of pitfall, without morphological correlation in the CT scan. We repeated the study in one of them, which made it possible to verify normalization of the hyperuptake, orienting us towards a possible pitfall.  相似文献   
886.
887.
888.
889.
ABSTRACT: BACKGROUND: Stressful life events are associated with mood disorders in adults in clinical settings. Less described in the literature is the association between common life stressors and a wide range of psychopathology in young adolescents. This study uses a large non-clinical sample of young adolescents to describe the associations among worry or stress about common life events/difficulties, mental health and substance use. METHODS: Data on lifetime stress or worry about common life events/difficulties (i.e., romantic breakups, family disruption, interpersonal difficulties, and personal stress (health, weight, school work)), symptoms of depression, conduct disorder symptoms, and substance use were collected from 1025 grade 7 students (mean age 12.9 years; 45% male). The association between each source of stress and each mental health and substance use indicator was modeled in separate logistic regression analyses. RESULTS: The proportion of adolescents reporting worry or stress ranged from 7% for new family to 53% for schoolwork. Romantic breakup stress was statistically significantly associated with all the mental health and substance use indicators except illicit drug use. Family disruption was statistically significantly associated with depression symptoms, marijuana use, and cigarette use. Interpersonal difficulties stress was statistically significantly associated with depression symptoms. All sources of personal stress were statistically significantly related to depression symptoms. In addition, health-related stress was inversely related to binge drinking. CONCLUSION: Young adolescents may benefit from learning positive coping skills to manage worry or stress about common stressors and in particular, worry or stress related to romantic breakups. Appropriate management of mental health symptoms and substance use related to common stressful life events and difficulties may help reduce emerging psychopathology.  相似文献   
890.

Purpose  

Controversial issues exist concerning criteria for patient selection and long-term success in pediatric neuroendoscopic procedures. We designed a classification of success grades applicable to high-pressure and chronic hydrocephalus and also to those cases in which different endoscopic maneuvers are performed during the same procedure. We then evaluated the success rate and complications in our series.  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