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   2438898篇
  免费   165689篇
  国内免费   4601篇
耳鼻咽喉   35521篇
儿科学   77394篇
妇产科学   67066篇
基础医学   344255篇
口腔科学   70762篇
临床医学   211760篇
内科学   473864篇
皮肤病学   57277篇
神经病学   195093篇
特种医学   93175篇
外国民族医学   714篇
外科学   364997篇
综合类   49931篇
现状与发展   7篇
一般理论   777篇
预防医学   179508篇
眼科学   57136篇
药学   186014篇
  10篇
中国医学   5926篇
肿瘤学   138001篇
  2021年   19020篇
  2019年   19860篇
  2018年   29652篇
  2017年   22570篇
  2016年   24765篇
  2015年   27296篇
  2014年   36652篇
  2013年   55542篇
  2012年   77128篇
  2011年   81187篇
  2010年   46642篇
  2009年   42865篇
  2008年   74785篇
  2007年   80663篇
  2006年   80280篇
  2005年   77630篇
  2004年   74329篇
  2003年   71297篇
  2002年   69072篇
  2001年   112041篇
  2000年   115172篇
  1999年   96766篇
  1998年   25789篇
  1997年   23035篇
  1996年   22342篇
  1995年   20981篇
  1994年   19354篇
  1992年   72719篇
  1991年   70007篇
  1990年   68719篇
  1989年   66557篇
  1988年   61446篇
  1987年   60118篇
  1986年   57364篇
  1985年   54306篇
  1984年   40487篇
  1983年   34342篇
  1982年   20158篇
  1979年   37958篇
  1978年   26685篇
  1977年   23477篇
  1976年   21062篇
  1975年   23957篇
  1974年   28270篇
  1973年   27635篇
  1972年   26254篇
  1971年   24670篇
  1970年   23131篇
  1969年   22332篇
  1968年   20559篇
排序方式: 共有10000条查询结果,搜索用时 46 毫秒
71.
72.
73.
74.
75.
76.
77.
Abstract

Supporting patients in making informed healthcare decisions is a cornerstone of ethical medical practice. Surgeons frequently draw for and show images to patients when consenting them for operations but the value of this practice in informed decision-making is unclear. An audit was conducted in a General Surgery Department. 244 patients completed questionnaires on the value of visual materials when giving consent for surgery. The complexity of the operations was classified into “simple”, “moderate” or “complex”. 100% of patients felt they had given informed consent to surgery. 62% of patients received at least one form of visual material during the consenting process. All patients who received a drawing, and 99% of those provided with other images, valued these resources. Visual materials were considered more useful to patients when giving consent for moderate or complex operations than simple ones. Approximately one third of patients who did not receive visual materials would have appreciated these when making an informed decision. This research highlights the value of surgeons drawing for, and providing other visual resources to, their patients as part of the consent process. There is a role for further research and training materials in drawing skills for surgeons.  相似文献   
78.
79.
Obesity Surgery - Laparoscopic sleeve gastrectomy (LSG) is increasingly playing a key role in obesity management. Such operations, however, carry complications sometimes including leaks. The...  相似文献   
80.
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   
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