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   1762261篇
  免费   136738篇
  国内免费   2999篇
耳鼻咽喉   23998篇
儿科学   59038篇
妇产科学   51151篇
基础医学   249005篇
口腔科学   52185篇
临床医学   153651篇
内科学   342743篇
皮肤病学   38069篇
神经病学   139592篇
特种医学   73685篇
外国民族医学   566篇
外科学   268755篇
综合类   40697篇
现状与发展   3篇
一般理论   546篇
预防医学   136881篇
眼科学   40277篇
药学   132491篇
  4篇
中国医学   3089篇
肿瘤学   95572篇
  2018年   17936篇
  2017年   15203篇
  2016年   15730篇
  2015年   19367篇
  2014年   24410篇
  2013年   34289篇
  2012年   51161篇
  2011年   48744篇
  2010年   28190篇
  2009年   28609篇
  2008年   44700篇
  2007年   47595篇
  2006年   48604篇
  2005年   54729篇
  2004年   55611篇
  2003年   49482篇
  2002年   44198篇
  2001年   78864篇
  2000年   79541篇
  1999年   70584篇
  1998年   18133篇
  1997年   16542篇
  1996年   16564篇
  1995年   16300篇
  1994年   15312篇
  1992年   60662篇
  1991年   59279篇
  1990年   58333篇
  1989年   56298篇
  1988年   52349篇
  1987年   51594篇
  1986年   49133篇
  1985年   47103篇
  1984年   34961篇
  1983年   29947篇
  1982年   16943篇
  1981年   15063篇
  1979年   33636篇
  1978年   23044篇
  1977年   19227篇
  1976年   18013篇
  1975年   19661篇
  1974年   24130篇
  1973年   23006篇
  1972年   21248篇
  1971年   20165篇
  1970年   18533篇
  1969年   17434篇
  1968年   15912篇
  1967年   14545篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
91.
92.
93.
94.
95.
96.
97.
98.
99.
Thyroid diseases are common, and use of levothyroxine is increasing worldwide. We investigated the influence of gender, race and socioeconomic status on the diagnosis and treatment of thyroid disorders using data from the Brazilian Longitudinal Study of Adult Health (ELSA-Brasil), a multicenter cohort study of civil servants (35-74 years of age) from six Brazilian cities. Diagnosis of thyroid dysfunction was by thyrotropin (TSH), and free thyroxine (FT4) if TSH was altered, and the use of specific medications. Multivariate logistic regression models were constructed using overt hyperthyroidism/hypothyroidism and levothyroxine use as dependent variables and sociodemographic characteristics as independent variables. The frequencies of overt hyper- and hypothyroidism were 0.7 and 7.4%, respectively. Using whites as the reference ethnicity, brown, and black race were protective for overt hypothyroidism (OR=0.76, 95%CI=0.64-0.89, and OR=0.53, 95%CI=0.43-0.67, respectively, and black race was associated with overt hyperthyroidism (OR=1.82, 95%CI=1.06-3.11). Frequency of hypothyroidism treatment was higher in women, browns, highly educated participants and those with high net family incomes. After multivariate adjustment, levothyroxine use was associated with female gender (OR=6.06, 95%CI=3.19-11.49) and high net family income (OR=3.23, 95%CI=1.02-10.23). Frequency of hyperthyroidism treatment was higher in older than in younger individuals. Sociodemographic factors strongly influenced the diagnosis and treatment of thyroid disorders, including the use of levothyroxine.  相似文献   
100.
Coronavirus disease 2019 (COVID-19) has resulted in many challenges in patient care, especially among high-risk populations such as heart transplant recipients. Patients with heart transplant experience a significantly higher mortality rate with COVID-19 infection, and management is based on extrapolation from clinical trials done on nontransplant patients and from clinical experience. Here we report 4 cases of patients with heart transplant who presented with COVID-19 infection in late 2020. Patients presented with symptoms similar to those seen in the general population. All 4 patients were admitted to the hospital, and they were all treated with dexamethasone. In addition, 2 patients received remdesivir. Immunosuppressive medications were adjusted to maintain adequate levels of immunosuppression but at the same time allow for an adequate immune response against the infection. All patients were discharged alive from the hospital. We then performed a literature review on studies that included heart transplant patients who developed the infection and developed suggestions for a standardized management approach, which we share in this article.  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