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   2648545篇
  免费   196624篇
  国内免费   4980篇
耳鼻咽喉   35016篇
儿科学   87325篇
妇产科学   72929篇
基础医学   382624篇
口腔科学   76620篇
临床医学   242623篇
内科学   514103篇
皮肤病学   59374篇
神经病学   208733篇
特种医学   98829篇
外国民族医学   496篇
外科学   390513篇
综合类   59944篇
现状与发展   6篇
一般理论   1048篇
预防医学   208302篇
眼科学   62293篇
药学   194664篇
  12篇
中国医学   5868篇
肿瘤学   148827篇
  2019年   20944篇
  2018年   29611篇
  2017年   22471篇
  2016年   24695篇
  2015年   28299篇
  2014年   39308篇
  2013年   58611篇
  2012年   80733篇
  2011年   85464篇
  2010年   50227篇
  2009年   47396篇
  2008年   79944篇
  2007年   85117篇
  2006年   85386篇
  2005年   82237篇
  2004年   79294篇
  2003年   75657篇
  2002年   73211篇
  2001年   128392篇
  2000年   131331篇
  1999年   109573篇
  1998年   29856篇
  1997年   26447篇
  1996年   26742篇
  1995年   25468篇
  1994年   23536篇
  1993年   21874篇
  1992年   84398篇
  1991年   82168篇
  1990年   79270篇
  1989年   76641篇
  1988年   70278篇
  1987年   68802篇
  1986年   65147篇
  1985年   61584篇
  1984年   46045篇
  1983年   39659篇
  1982年   22881篇
  1979年   42141篇
  1978年   29883篇
  1977年   25290篇
  1976年   23572篇
  1975年   25067篇
  1974年   30486篇
  1973年   29725篇
  1972年   27726篇
  1971年   25806篇
  1970年   24211篇
  1969年   22764篇
  1968年   21204篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
1.
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   
2.

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   
3.
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