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   2693687篇
  免费   198956篇
  国内免费   15443篇
耳鼻咽喉   35227篇
儿科学   86558篇
妇产科学   73612篇
基础医学   376539篇
口腔科学   71503篇
临床医学   249208篇
内科学   531888篇
皮肤病学   63703篇
神经病学   219334篇
特种医学   103807篇
外国民族医学   806篇
外科学   397710篇
综合类   68723篇
现状与发展   29篇
一般理论   971篇
预防医学   202670篇
眼科学   59965篇
药学   199784篇
  119篇
中国医学   11298篇
肿瘤学   154632篇
  2021年   25568篇
  2019年   24483篇
  2018年   33193篇
  2017年   26086篇
  2016年   29433篇
  2015年   34439篇
  2014年   46586篇
  2013年   66113篇
  2012年   88553篇
  2011年   93686篇
  2010年   56629篇
  2009年   53547篇
  2008年   85065篇
  2007年   89856篇
  2006年   91629篇
  2005年   87816篇
  2004年   82815篇
  2003年   79935篇
  2002年   76591篇
  2001年   130908篇
  2000年   133946篇
  1999年   113414篇
  1998年   33333篇
  1997年   29956篇
  1996年   29701篇
  1995年   28748篇
  1994年   26265篇
  1993年   24186篇
  1992年   86136篇
  1991年   82451篇
  1990年   79531篇
  1989年   76705篇
  1988年   70028篇
  1987年   68522篇
  1986年   63925篇
  1985年   60865篇
  1984年   45130篇
  1983年   38082篇
  1982年   22543篇
  1981年   20075篇
  1979年   39038篇
  1978年   27479篇
  1977年   23275篇
  1976年   21502篇
  1975年   22791篇
  1974年   26777篇
  1973年   25356篇
  1972年   23744篇
  1971年   21947篇
  1970年   20168篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
121.
122.
Abstract

Objective

The sex, age, medical history, treatment, tobacco use, race risk (SAMe-TT2R2) Score; the sex, age, medical history, treatment, tobacco use, genotype combination (SAMe-TT2G2) Score; and the so-called modified SAMe-TT2R2 scores have been proposed to predict the anticoagulation quality for patients with non-valvular atrial fibrillation (NVAF). The data from a prospective controlled study is used to validate the SAMe-TT2R2 and SAMe-TT2G2 scores in Chinese NVAF patients treated with warfarin and to evaluate the association of factors with time in therapeutic range (TTR) to predict the quality of oral anticoagulation control.  相似文献   
123.
Behçet disease is a complex, multisystem disease characterized by recurrent oral and genital ulcerations. It rarely occurs in infants or children. Neonatal Behçet disease has been reported in infants whose ulcers resolve at or before 9 weeks of age. Few cases of neonatal Behçet disease persisting into childhood have previously been reported. We report the case of a 1‐month‐old infant who presented with severe recurrent genital ulcerations and at 6 months developed recurrent oral ulcerations. Her orogenital ulcerations continue to recur. Human leukocyte antigen testing revealed HLA‐B51 and B44 positivity. This is a case of pediatric Behçet disease in the neonatal period. Behçet disease should be considered in the differential diagnosis of recurrent genital and oral ulcerations in infants and children.  相似文献   
124.
Objectives:To report if the association of epilepsy in pediatric patients (below the age of 15 years) with Insulin-dependent Diabetes (IDDM) at King Fahad Medical City (KFMC) is higher than the prevalence of epilepsy in the same age group (who have no IDDM) in our community. Consequently, we would determine if there is a relationship between the presence of epilepsy in diabetic children and the presence of positive antiGAD65 antibodies.Methods:This cohort study included 305 pediatric patients below the age of 15 years with Insulin-dependent Diabetes Mellitus (IDDM). They were randomly recruited at the Pediatric Endocrinology Clinic in KFMC. The patients’ caregivers were given a questionnaire between December 2015 till March 2019 to determine the seizure disorder history. There was also a retrospective review of 214 patients’ files for anti-GAD 65 positivity.Results:Our study found a significant relation between the presence of epilepsy in children with IDDM. Therefore, we could confirm the relationship between the existence of epilepsy in children with IDDM and having positive GAD65 antibodies.Conclusion:Our study supports the presence of consistent relation between having IDDM and having epilepsy in children and between the latter and the presence of positive GAD65 antibodies.

Insulin dependent diabetes Mellitus (IDDM) is a common condition in children and adolescents worldwide and so is epilepsy.1,2 Recently, there were increasing reports suggesting a potential association between having IDDM and the occurrence of epilepsy.3 Their association might represent simply a chance to relate their underlying mechanisms. However, the cause-effect relationship is not fully well defined. Literature from other countries have shown the increased prevalence of seizure disorders in this group of patients.4,5 There are scarce studies in the literature investigating IDDM characteristics contributing to having epilepsy, including positive GAD 65 antibodies. In this study that ran in King Fahad Medical City, Riyadh, Kingdom of Saudi Arabia (KSA) we are aiming to determine if the prevalence of epilepsy among 1DDM children under the age of 15 years (in our center) is higher than controls (same age without IDDM), and to check the positivity of anti-GAD 65 amongst those patients in order to find if there is a relationship between epilepsy in children with diabetes and the presence of positive GAD65 Antibodies.  相似文献   
125.
126.
127.
Nevo  N.  Goldstein  A. L.  Staierman  M.  Eran  N.  Carmeli  I.  Rayman  S.  mnouskin  Y. 《Hernia》2022,26(6):1491-1499
Hernia - The minimally invasive surgical repair of combined inguinal and ventral hernias often requires shifting from one approach or plane to another. The traditional enhanced-view totally...  相似文献   
128.
129.
130.
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