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   228378篇
  免费   37629篇
  国内免费   2621篇
耳鼻咽喉   6237篇
儿科学   7582篇
妇产科学   3973篇
基础医学   12973篇
口腔科学   3121篇
临床医学   34422篇
内科学   63108篇
皮肤病学   8582篇
神经病学   22097篇
特种医学   9313篇
外国民族医学   5篇
外科学   53852篇
综合类   1379篇
现状与发展   72篇
一般理论   101篇
预防医学   14005篇
眼科学   4857篇
药学   6326篇
中国医学   128篇
肿瘤学   16495篇
  2024年   532篇
  2023年   5088篇
  2022年   1610篇
  2021年   4924篇
  2020年   6909篇
  2019年   3807篇
  2018年   9214篇
  2017年   8629篇
  2016年   9673篇
  2015年   9875篇
  2014年   17671篇
  2013年   18820篇
  2012年   10663篇
  2011年   10898篇
  2010年   13198篇
  2009年   16633篇
  2008年   10525篇
  2007年   9104篇
  2006年   11380篇
  2005年   8652篇
  2004年   7646篇
  2003年   6278篇
  2002年   6060篇
  2001年   4666篇
  2000年   3827篇
  1999年   4158篇
  1998年   4444篇
  1997年   4172篇
  1996年   4033篇
  1995年   3828篇
  1994年   2548篇
  1993年   2113篇
  1992年   2064篇
  1991年   2080篇
  1990年   1622篇
  1989年   1732篇
  1988年   1525篇
  1987年   1362篇
  1986年   1396篇
  1985年   1338篇
  1984年   1201篇
  1983年   1047篇
  1982年   1165篇
  1981年   1002篇
  1980年   893篇
  1979年   669篇
  1978年   726篇
  1977年   752篇
  1976年   541篇
  1975年   583篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
111.
112.
113.
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   
114.
115.
116.
117.
This study was aimed at determining the cause for the high incidence of tuberculosis (TB) reactivation occurring in males with a low body mass index (BMI). Current thinking about pulmonary TB describes infection in the lung apex resulting in cavitation after reactivation. A different hypothesis is put forward for TB infection, suggesting that this occurs in subclinical apical cavities caused by increased pleural stress due to a low BMI body habitus. A finite element analysis (FEA) model of a lung was constructed including indentations for the first rib guided by paramedian sagittal CT reconstructions, and simulations were conducted with varying antero‐posterior (AP) diameters to mimic chests with a different thoracic index (ratio of AP to the transverse chest diameters). A Pubmed search was conducted about gender and thoracic index, and the effects of BMI on TB. FEA modeling revealed a tenfold increase in stress levels at the lung apex in low BMI chests, and a four‐fold increase with a low thoracic index, r2 = 0.9748 P < 0.001. Low thoracic index was related to BMI, P = 0.001. The mean thoracic index was statistically significantly lower in males, P = 0.001, and increased with age in both genders. This article is the first to suggest a possible mechanism linking pulmonary TB reactivation to low BMI due to the flattened thoracic wall shape of young male adults. The low thoracic index in young males may promote TB reactivation due to tissue destruction in the lung apex from high pleural stress levels. Clin. Anat. 28:614–620, 2015. © 2015 Wiley Periodicals, Inc.  相似文献   
118.
A cluster randomized experiment was undertaken testing two sets of interventions encouraging enrollment in the Individually Paying Program (IPP), the voluntary component of the Philippines' social health insurance program. In early 2011, 1037 unenrolled IPP‐eligible families in 179 randomly selected intervention municipalities were given an information kit and offered a 50% premium subsidy valid until the end of 2011; 383 IPP‐eligible families in 64 control municipalities were not. In February 2012, the 787 families in the intervention sites who were still IPP‐eligible but had not enrolled had their vouchers extended, were resent the enrollment kits and received SMS reminders. Half the group also received a ‘handholding’ intervention: in the endline interview, the enumerator offered to help complete the enrollment form, deliver it to the insurer's office in the provincial capital, and mail the membership cards. The main intervention raised the enrollment rate by 3 percentage points (ppts) (p = 0.11), with an 8 ppt larger effect (p < 0.01) among city‐dwellers, consistent with travel time to the insurance office affecting enrollment. The handholding intervention raised enrollment by 29 ppts (p < 0.01), with a smaller effect (p < 0.01) among city‐dwellers, likely because of shorter travel times, and higher education levels facilitating unaided completion of the enrollment form. Copyright © The World Bank Health Economics © 2015 John Wiley & Sons, Ltd.  相似文献   
119.
120.
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