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   35446篇
  免费   2933篇
  国内免费   206篇
耳鼻咽喉   348篇
儿科学   1243篇
妇产科学   871篇
基础医学   4277篇
口腔科学   725篇
临床医学   3488篇
内科学   7492篇
皮肤病学   631篇
神经病学   2920篇
特种医学   1095篇
外科学   5058篇
综合类   839篇
一般理论   18篇
预防医学   2491篇
眼科学   1372篇
药学   2570篇
  1篇
中国医学   133篇
肿瘤学   3013篇
  2023年   248篇
  2022年   451篇
  2021年   953篇
  2020年   623篇
  2019年   872篇
  2018年   973篇
  2017年   684篇
  2016年   819篇
  2015年   898篇
  2014年   1226篇
  2013年   1472篇
  2012年   2352篇
  2011年   2408篇
  2010年   1367篇
  2009年   1203篇
  2008年   2063篇
  2007年   2075篇
  2006年   1893篇
  2005年   1797篇
  2004年   1742篇
  2003年   1560篇
  2002年   1386篇
  2001年   1151篇
  2000年   1037篇
  1999年   898篇
  1998年   337篇
  1997年   258篇
  1996年   228篇
  1995年   228篇
  1994年   198篇
  1993年   180篇
  1992年   515篇
  1991年   486篇
  1990年   447篇
  1989年   406篇
  1988年   369篇
  1987年   339篇
  1986年   335篇
  1985年   331篇
  1984年   224篇
  1983年   210篇
  1982年   142篇
  1981年   109篇
  1980年   114篇
  1979年   164篇
  1978年   95篇
  1977年   104篇
  1976年   73篇
  1974年   88篇
  1973年   74篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
2.

Female Genital mutilation/cutting (FGM/C) is associated with enduring psychiatric complications. In this study, we investigate the rates of co-morbid abuses and polyvictimization experienced by survivors of FGM/C. This is a sub-analysis of a cohort study examining the patient population at the EMPOWER Center for Survivors of Sex Trafficking and Sexual Violence in New York City. A retrospective chart-review of electronic medical records was conducted for all consenting adult patients who had FGM/C and had an intake visit between January 16, 2014 and March 6, 2020. Of the 80 participants, ages ranged from 20 to 62 years with a mean of 37.4 (SD?=?9.1) years. In addition to FGM/C, participants were victims of physical abuse (43; 53.8%), emotional abuse (35; 43.8%), sexual abuse (35; 43.8%), forced marriage (20; 25%), child marriage (13; 16.3%), and sex trafficking (1; 1.4%). There was a high degree of polyvictimization, with 41 (51.2%) experiencing 3 or more of the aforementioned abuses. Having FGM/C on or after age 13 or having a higher total abuse score was also found to be strong predictors of depression and PTSD. The high rates of polyvictimization among survivors of FGM/C are associated with development of depression and PTSD. Despite co-morbid abuses, patients still attribute substantial psychiatric symptoms to their FGM/C. Health care providers should understand the high risk of polyvictimization when caring for this patient population.

  相似文献   
3.
4.
5.
Prevalence of osteoporosis is more than 50% in older adults, yet current clinical methods for diagnosis that rely on areal bone mineral density (aBMD) fail to detect most individuals who have a fragility fracture. Bone fragility can manifest in different forms, and a “one-size-fits-all” approach to diagnosis and management of osteoporosis may not be suitable. High-resolution peripheral quantitative computed tomography (HR-pQCT) provides additive information by capturing information about volumetric density and microarchitecture, but interpretation is challenging because of the complex interactions between the numerous properties measured. In this study, we propose that there are common combinations of bone properties, referred to as phenotypes, that are predisposed to different levels of fracture risk. Using HR-pQCT data from a multinational cohort (n = 5873, 71% female) between 40 and 96 years of age, we employed fuzzy c-means clustering, an unsupervised machine-learning method, to identify phenotypes of bone microarchitecture. Three clusters were identified, and using partial correlation analysis of HR-pQCT parameters, we characterized the clusters as low density, low volume, and healthy bone phenotypes. Most males were associated with the healthy bone phenotype, whereas females were more often associated with the low volume or low density bone phenotypes. Each phenotype had a significantly different cumulative hazard of major osteoporotic fracture (MOF) and of any incident osteoporotic fracture (p < 0.05). After adjustment for covariates (cohort, sex, and age), the low density followed by the low volume phenotype had the highest association with MOF (hazard ratio = 2.96 and 2.35, respectively), and significant associations were maintained when additionally adjusted for femoral neck aBMD (hazard ratio = 1.69 and 1.90, respectively). Further, within each phenotype, different imaging biomarkers of fracture were identified. These findings suggest that osteoporotic fracture risk is associated with bone phenotypes that capture key features of bone deterioration that are not distinguishable by aBMD. © 2021 American Society for Bone and Mineral Research (ASBMR).  相似文献   
6.
Abstract

Objective

Ras wild-type metastatic colorectal cancers (mCRC) may be treated with anti-vascular endothelial growth factor (VEGF) or anti-epidermal growth factor receptor (EGFR) agents. We aim to estimate patients’ preferences for mCRC treatment and relative importance of cost, efficacy improvement, avoidance of side effects and therapy convenience, and relative uptake between profiles that resemble Bevacizumab (anti-VEGF) and Cetuximab (anti-EGFR), two commonly prescribed mCRC targeted therapies.  相似文献   
7.
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