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   2691349篇
  免费   194794篇
  国内免费   5852篇
耳鼻咽喉   37751篇
儿科学   86694篇
妇产科学   76130篇
基础医学   381773篇
口腔科学   79877篇
临床医学   237788篇
内科学   521492篇
皮肤病学   61238篇
神经病学   211309篇
特种医学   103382篇
外国民族医学   659篇
外科学   410655篇
综合类   62896篇
现状与发展   10篇
一般理论   926篇
预防医学   196473篇
眼科学   65139篇
药学   199649篇
  10篇
中国医学   6433篇
肿瘤学   151711篇
  2018年   28044篇
  2017年   21634篇
  2016年   24004篇
  2015年   27254篇
  2014年   38025篇
  2013年   56634篇
  2012年   76770篇
  2011年   81163篇
  2010年   48223篇
  2009年   45555篇
  2008年   76215篇
  2007年   82182篇
  2006年   82793篇
  2005年   79635篇
  2004年   77216篇
  2003年   73984篇
  2002年   71951篇
  2001年   131640篇
  2000年   134799篇
  1999年   112767篇
  1998年   30546篇
  1997年   27271篇
  1996年   26742篇
  1995年   25523篇
  1994年   23548篇
  1993年   21932篇
  1992年   86520篇
  1991年   84104篇
  1990年   81555篇
  1989年   78941篇
  1988年   72553篇
  1987年   71308篇
  1986年   67715篇
  1985年   64357篇
  1984年   47958篇
  1983年   40878篇
  1982年   23834篇
  1981年   21530篇
  1979年   44485篇
  1978年   31297篇
  1977年   26881篇
  1976年   24655篇
  1975年   27208篇
  1974年   32581篇
  1973年   31612篇
  1972年   29838篇
  1971年   27802篇
  1970年   26110篇
  1969年   24745篇
  1968年   23258篇
排序方式: 共有10000条查询结果,搜索用时 218 毫秒
1.
Quality of Life Research - The COVID-19 pandemic might add to the stressors experienced by people living with rheumatic diseases. This study aimed to examine rheumatic patients’ functional...  相似文献   
2.
Molnár  B.  Aroca  S.  Dobos  A.  Orbán  K.  Szabó  J.  Windisch  P.  Stähli  A.  Sculean  A. 《Clinical oral investigations》2022,26(12):7135-7142
Clinical Oral Investigations - To evaluate t he long-term outcomes following treatment of RT 1 multiple adjacent gingival recessions (MAGR) using the modified coronally advanced tunnel (MCAT) with...  相似文献   
3.

Interstitial lung disease (ILD) represents a significant cause of morbidity and mortality in systemic sclerosis (SSc). The purpose of this study was to examine recirculating lymphocytes from SSc patients for potential biomarkers of interstitial lung disease (ILD). Peripheral blood mononuclear cells (PBMCs) were isolated from patients with SSc and healthy controls enrolled in the Vanderbilt University Myositis and Scleroderma Treatment Initiative Center cohort between 9/2017–6/2019. Clinical phenotyping was performed by chart abstraction. Immunophenotyping was performed using both mass cytometry and fluorescence cytometry combined with t-distributed stochastic neighbor embedding analysis and traditional biaxial gating. This study included 34 patients with SSc-ILD, 14 patients without SSc-ILD, and 25 healthy controls. CD21lo/neg cells are significantly increased in SSc-ILD but not in SSc without ILD (15.4 ± 13.3% vs. 5.8 ± 0.9%, p = 0.002) or healthy controls (5.0 ± 0.5%, p < 0.0001). While CD21lo/neg B cells can be identified from a single biaxial gate, tSNE analysis reveals that the biaxial gate is comprised of multiple distinct subsets, all of which are increased in SSc-ILD. CD21lo/neg cells in both healthy controls and SSc-ILD are predominantly tBET positive and do not have intracellular CD21. Immunohistochemistry staining demonstrated that CD21lo/neg B cells diffusely infiltrate the lung parenchyma of an SSc-ILD patient. Additional work is needed to validate this biomarker in larger cohorts and longitudinal studies and to understand the role of these cells in SSc-ILD.

  相似文献   
4.
Die Anaesthesiologie - Auch wenn für Anästhesiologen über Jahrzehnte die Prophylaxe und Therapie postoperativer Schmerzen im Rahmen des postoperativen Patientenkomforts an vorderster...  相似文献   
5.
6.
7.
8.
9.
10.
PurposeUnderstanding the value of genetic screening and testing for monogenic disorders requires high-quality, methodologically robust economic evaluations. This systematic review sought to assess the methodological quality among such studies and examined opportunities for improvement.MethodsWe searched PubMed, Cochrane, Embase, and Web of Science for economic evaluations of genetic screening/testing (2013-2019). Methodological rigor and adherence to best practices were systematically assessed using the British Medical Journal checklist.ResultsAcross the 47 identified studies, there were substantial variations in modeling approaches, reporting detail, and sophistication. Models ranged from simple decision trees to individual-level microsimulations that compared between 2 and >20 alternative interventions. Many studies failed to report sufficient detail to enable replication or did not justify modeling assumptions, especially for costing methods and utility values. Meta-analyses, systematic reviews, or calibration were rarely used to derive parameter estimates. Nearly all studies conducted some sensitivity analysis, and more sophisticated studies implemented probabilistic sensitivity/uncertainty analysis, threshold analysis, and value of information analysis.ConclusionWe describe a heterogeneous body of work and present recommendations and exemplar studies across the methodological domains of (1) perspective, scope, and parameter selection; (2) use of uncertainty/sensitivity analyses; and (3) reporting transparency for improvement in the economic evaluation of genetic screening/testing.  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