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   741528篇
  免费   73891篇
  国内免费   850篇
耳鼻咽喉   10013篇
儿科学   24940篇
妇产科学   16550篇
基础医学   127044篇
口腔科学   21905篇
临床医学   68167篇
内科学   147743篇
皮肤病学   22422篇
神经病学   57899篇
特种医学   25106篇
外国民族医学   54篇
外科学   107390篇
综合类   8310篇
现状与发展   2篇
一般理论   147篇
预防医学   60431篇
眼科学   16915篇
药学   57682篇
  1篇
中国医学   2680篇
肿瘤学   40868篇
  2021年   7575篇
  2020年   8518篇
  2019年   16932篇
  2018年   19103篇
  2017年   17080篇
  2016年   18435篇
  2015年   19166篇
  2014年   21313篇
  2013年   26911篇
  2012年   28254篇
  2011年   30519篇
  2010年   22908篇
  2009年   17254篇
  2008年   25317篇
  2007年   26508篇
  2006年   25702篇
  2005年   24490篇
  2004年   23484篇
  2003年   22492篇
  2002年   21772篇
  2001年   27302篇
  2000年   28144篇
  1999年   22623篇
  1998年   5901篇
  1997年   4809篇
  1996年   4845篇
  1992年   16310篇
  1991年   17525篇
  1990年   17617篇
  1989年   17012篇
  1988年   15673篇
  1987年   15452篇
  1986年   14471篇
  1985年   13925篇
  1984年   10291篇
  1983年   8760篇
  1979年   9937篇
  1978年   7035篇
  1977年   5800篇
  1976年   6124篇
  1975年   7334篇
  1974年   8371篇
  1973年   8123篇
  1972年   7533篇
  1971年   7205篇
  1970年   6726篇
  1969年   6350篇
  1968年   6084篇
  1967年   5443篇
  1966年   4714篇
排序方式: 共有10000条查询结果,搜索用时 234 毫秒
1.
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.
Journal of Behavioral Medicine - Evidence supports the use of graphic warnings to educate the public about the health harms of smoking and suggests warnings eliciting negative emotional responses...  相似文献   
4.
ObjectiveSpinal cord stimulation (SCS) is an effective treatment in failed back surgery syndrome (FBSS). We studied the effect of preimplantation opioid use on SCS outcome and the effect of SCS on opioid use during a two-year follow-up period.Materials and methodsThe study cohort included 211 consecutive FBSS patients who underwent an SCS trial from January 1997 to March 2014. Participants were divided into groups, which were as follows: 1) SCS trial only (n = 47), 2) successful SCS (implanted and in use throughout the two-year follow-up period, n = 131), and 3) unsuccessful SCS (implanted but later explanted or revised due to inadequate pain relief, n = 29). Patients who underwent explantation for other reasons (n = 4) were excluded. Opioid purchase data from January 1995 to March 2016 were retrieved from national registries.ResultsHigher preimplantation opioid doses associated with unsuccessful SCS (ROC: AUC = 0.66, p = 0.009), with 35 morphine milligram equivalents (MME)/day as the optimal cutoff value. All opioids were discontinued in 23% of patients with successful SCS, but in none of the patients with unsuccessful SCS (p = 0.004). Strong opioids were discontinued in 39% of patients with successful SCS, but in none of the patients with unsuccessful SCS (p = 0.04). Mean opioid dose escalated from 18 ± 4 MME/day to 36 ± 6 MME/day with successful SCS and from 22 ± 8 MME/day to 82 ± 21 MME/day with unsuccessful SCS (p < 0.001).ConclusionsHigher preimplantation opioid doses were associated with SCS failure, suggesting the need for opioid tapering before implantation. With continuous SCS therapy and no explantation or revision due to inadequate pain relief, 39% of FBSS patients discontinued strong opioids, and 23% discontinued all opioids. This indicates that SCS should be considered before detrimental dose escalation.  相似文献   
5.
The adrenal cortex gives rise to a biologically heterogenous group of neoplasms, each with a distinct morphology, antigen expression and molecular profile. Adrenal cortical adenomas have excellent prognosis and are usually cured by surgical resection alone, while adrenal cortical carcinomas are very aggressive tumors with a poor prognosis regardless of therapy. These tumors are rare and often challenging for a pathologist to diagnose, as significant overlap exists between benign and malignant lesions in some cases. In this review, we attempt to summarize most important histologic and clinical features of adrenal cortical adenomas and carcinomas, clarify the use of different grading systems, the use of special stains and the differential diagnosis for practicing pathologists. Most relevant hereditary syndromes associated with adrenal cortical tumors are listed. Updates in molecular alterations in adrenal cortical neoplasms and hyperplastic diseases as well as their clinical significance and potential therapeutic implications are also discussed.  相似文献   
6.
7.
8.
9.
10.
Journal of Immigrant and Minority Health - COVID-19 has disproportionally affected underrepresented minorities (URM) and low-income immigrants in the United States. The aim of the study is to...  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