首页 | 官方网站   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   9808篇
  免费   815篇
  国内免费   93篇
医药卫生   10716篇
  2021年   88篇
  2020年   77篇
  2019年   95篇
  2018年   122篇
  2017年   99篇
  2016年   81篇
  2015年   130篇
  2014年   169篇
  2013年   274篇
  2012年   340篇
  2011年   341篇
  2010年   235篇
  2009年   244篇
  2008年   363篇
  2007年   407篇
  2006年   400篇
  2005年   424篇
  2004年   339篇
  2003年   323篇
  2002年   306篇
  2001年   304篇
  2000年   284篇
  1999年   291篇
  1998年   212篇
  1997年   237篇
  1996年   196篇
  1995年   203篇
  1994年   186篇
  1993年   179篇
  1992年   280篇
  1991年   250篇
  1990年   226篇
  1989年   271篇
  1988年   224篇
  1987年   208篇
  1986年   209篇
  1985年   202篇
  1984年   177篇
  1983年   157篇
  1982年   97篇
  1981年   107篇
  1980年   103篇
  1979年   135篇
  1978年   92篇
  1977年   91篇
  1976年   103篇
  1975年   77篇
  1973年   88篇
  1972年   81篇
  1968年   85篇
排序方式: 共有10000条查询结果,搜索用时 88 毫秒
1.
Erosive pustular dermatosis of the scalp (EPDS) is an uncommon chronic inflammatory response to scalp trauma that usually resolves with cicatricial alopecia. It most commonly affects elderly patients with a history of actinic damage. Herein, we describe a 16‐year‐old girl with acrofacial dysostosis type 1 presenting after surgery with crusting purulent scalp lesions, whose clinical presentation and histopathologic findings were consistent with EPDS. A review of the literature on EPDS in children is also detailed.  相似文献   
2.
3.
4.
5.
Although studies have documented underuse of controller medications and overuse of short-acting inhaled ss(2)-agonist among children with persistent asthma in disadvantaged communities, the persistence of oral ss(2)-agonist use in pediatric practice has not been studied since inhaled short-acting ss(2)-agonists became widespread. We describe medications used to treat asthma among children 3 to 5 years of age at 10 Head Start and other subsidized preschool centers in East and Central Harlem, New York City. We interviewed 149 parents/guardians of children who were identified as having probable asthma based on physician's diagnosis, persistent symptoms, hospitalization, and medication use. We classified 86 of the 149 children (58%) as having current persistent asthma. Only 15 of them (17%) were reported to have used controller medications at least 5 days/week in the last 4 weeks-only 2 of whom used inhaled corticosteroids. By contrast, 53 children (62%) used oral ss(2)-agonist in the last 4 weeks, often (72%) in conjunction with nebulized or inhaled short-acting ss(2)-agonist. Use of oral ss(2)-agonist was associated with more severe symptoms. This study documents the continued widespread use of oral ss(2)-agonist for treatment of children in a low-income community with high prevalence of asthma.  相似文献   
6.
Cutaneous plasmacytosis is a rare disorder characterized by a benign proliferation of mature plasma cells that appears as multiple dark-brown to purplish skin lesions, often associated with polyclonal hypergammaglobulinaemia. We present the case of a 55-year-old Caucasian man who suffered from a cutaneous plasmacytosis associated with two different carcinomas. Cutaneous plasmacytosis seems to be a reactive process because most cases reported are not associated with any apparent underlying disease. Nevertheless, because few reported cases were associated with malignancies, screening of additional neoplasms would be justified.  相似文献   
7.
8.
9.
To measure prefrontal and subcortical activity during a cognitive task, we examined 19 newly diagnosed schizophrenics and patients with schizophreniform psychosis. Seven healthy volunteers served as controls. The patients were drug naive or had received neuroleptics for a few days only. Cerebral blood flow distribution was depicted by single photon emission computed tomography at rest and during activation with the Wisconsin Card Sorting Test. A significant relative activation deficit in the left inferior-prefrontal region was revealed during the Wisconsin Card Sorting Test in the patient group. Furthermore, the patients had impaired striatal suppression on the left side during the cognitive task. The test performance was significantly impaired in the patients. The inability to reduce striatal activity may be due to a lack of corticostriatal feedback during prefrontal activation.  相似文献   
10.
Long-term care is now the most common cause of catastrophic illness costs for the elderly. Although acute care health insurance represents a mature market, private long-term care insurance is in its infancy and poised for development. This study presents a comparative analysis of simulation data, generated from the Brookings-ICF Long-Term Care Financing Model, for five alternative private long-term care insurance models. The simulation results indicate 1) the potential market for private long-term care insurance is substantial, 2) moderately comprehensive long-term care policies are affordable by a significant minority of the elderly, 3) policies are considerably more affordable to those under age 65, and 4) long-term care insurance has somewhat less potential to pay for nursing home costs for high risk groups than for other elderly.  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-23

京公网安备 11010802026262号