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   181161篇
  免费   33307篇
  国内免费   2434篇
耳鼻咽喉   5627篇
儿科学   6260篇
妇产科学   3245篇
基础医学   7102篇
口腔科学   2254篇
临床医学   30316篇
内科学   52373篇
皮肤病学   7714篇
神经病学   17172篇
特种医学   7452篇
外科学   45539篇
综合类   813篇
现状与发展   72篇
一般理论   16篇
预防医学   10312篇
眼科学   3847篇
药学   2992篇
中国医学   88篇
肿瘤学   13708篇
  2024年   703篇
  2023年   4894篇
  2022年   1393篇
  2021年   3542篇
  2020年   6291篇
  2019年   2631篇
  2018年   7898篇
  2017年   7732篇
  2016年   8784篇
  2015年   8881篇
  2014年   16143篇
  2013年   16557篇
  2012年   6961篇
  2011年   6953篇
  2010年   11136篇
  2009年   14922篇
  2008年   7145篇
  2007年   5461篇
  2006年   7801篇
  2005年   5103篇
  2004年   4475篇
  2003年   3290篇
  2002年   3265篇
  2001年   4667篇
  2000年   3902篇
  1999年   3952篇
  1998年   4072篇
  1997年   3850篇
  1996年   3731篇
  1995年   3564篇
  1994年   2195篇
  1993年   1789篇
  1992年   2004篇
  1991年   1939篇
  1990年   1579篇
  1989年   1687篇
  1988年   1508篇
  1987年   1296篇
  1986年   1366篇
  1985年   1190篇
  1984年   944篇
  1983年   856篇
  1982年   764篇
  1981年   636篇
  1980年   605篇
  1979年   675篇
  1978年   595篇
  1977年   654篇
  1975年   478篇
  1972年   517篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
81.
Marielle Kabbouche MD  FAHS 《Headache》2015,55(10):1426-1429
Status migrainosus is defined by the international classification of headache disorders (ICHD) criteria as a debilitating migraine lasting more then 72 hours. The epidemiology of status migrainosus is still unknown in adult and children, and frequently underdiagnosed. Children and adolescents often end up in the emergency room with an intractable headache that failed outpatient therapy. Six to seven percent of these children do not respond to acute infusion therapy and require hospitalization. It is imperative that more aggressive therapy is considered when patients are affected by a severe intractable headache to prevent further disability and returning the child to baseline activity. Multiple therapies are available for adults and children. Studies for acute therapy in the emergency room are available in adults and pediatric groups. Small studies are available for inpatient therapy in children and, along with available therapies for children and adolescents, are described in this review. A review of the literature shows growing evidence regarding the use of dihydroergotamine intravenously once patients are hospitalized. Effectiveness and safety have been proven in the last decades in adults and small studies in the pediatric populations.  相似文献   
82.
83.
84.
85.
Abstract

The purpose of this study was to investigate the strength of the relationships between self-efficacy and (i) functional exercise capacity and (ii) physical activity in chronic obstructive pulmonary disease (COPD), and whether self-efficacy assessment type (i.e., COPD symptoms, exercise-task, exercise-barrier, general, falls) and physical activity assessment type (i.e., self-report vs. objective) are moderators. A systematic search of COPD and self-efficacy concepts was conducted using eight databases from inception to 23 January 2019. Studies were included if they provided correlation coefficients of the relationship between self-efficacy and functional exercise capacity or physical activity, were conducted in adults diagnosed with COPD, and were published in English-language journals. A total of 14 correlation coefficients were included in the self-efficacy and functional exercise capacity meta-analysis, and 16 in the self-efficacy and physical activity meta-analysis. Data were screened, reviewed, and extracted independently by two reviewers, with discrepancies resolved by a third reviewer. Stronger self-efficacy was associated with better functional exercise capacity (weighted r?=?0.38, 95%CI [0.25, 0.50]), and greater physical activity (weighted r?=?0.25, 95%CI [0.17, 0.34]). Exercise-task self-efficacy had the strongest relationship to functional exercise capacity (weighted r?=?0.64, 95% CI [0.51, 0.73]). For physical activity, the type of self-efficacy most strongly related was inconclusive. In COPD, self-efficacy has a relationship to functional exercise capacity and physical activity, the strength of which is influenced by the choice of self-efficacy measure. An understanding of these relationships will assist clinicians in selecting the self-efficacy measure most closely related to the outcome of interest.  相似文献   
86.
87.
88.
89.
Gorlin syndrome (naevoid basal cell carcinoma syndrome) is a genetically linked disorder characterized by the development of multiple basal cell carcinomas (BCCs) throughout life. Cumulative surgery, cryotherapy and other conventional interventions can result in significant disfigurement by middle age. Radiotherapy is contra-indicated because the mutated gene underlying the syndrome, ‘PTCH’, increases sensitivity to ionising radiation, so there is significant likelihood of inducing further tumours in and around the irradiated area. Photodynamic therapy offers a non-invasive treatment option for patients with this condition, with the added advantage of causing minimal scarring.  相似文献   
90.
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