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   1601274篇
  免费   133827篇
  国内免费   2679篇
耳鼻咽喉   21653篇
儿科学   52969篇
妇产科学   46264篇
基础医学   227955篇
口腔科学   47227篇
临床医学   141039篇
内科学   314849篇
皮肤病学   34121篇
神经病学   130223篇
特种医学   64803篇
外国民族医学   474篇
外科学   244075篇
综合类   40010篇
现状与发展   3篇
一般理论   544篇
预防医学   122924篇
眼科学   36498篇
药学   121547篇
  7篇
中国医学   3110篇
肿瘤学   87485篇
  2018年   14875篇
  2016年   12990篇
  2015年   15157篇
  2014年   20766篇
  2013年   31499篇
  2012年   42735篇
  2011年   44934篇
  2010年   26481篇
  2009年   25418篇
  2008年   43150篇
  2007年   45366篇
  2006年   46182篇
  2005年   44782篇
  2004年   44208篇
  2003年   42268篇
  2002年   41374篇
  2001年   75721篇
  2000年   78348篇
  1999年   66411篇
  1998年   17750篇
  1997年   16349篇
  1996年   16328篇
  1995年   16032篇
  1994年   15080篇
  1993年   14229篇
  1992年   55440篇
  1991年   53793篇
  1990年   52577篇
  1989年   50845篇
  1988年   47229篇
  1987年   46572篇
  1986年   44291篇
  1985年   42853篇
  1984年   32037篇
  1983年   27570篇
  1982年   16148篇
  1981年   14437篇
  1980年   13566篇
  1979年   30462篇
  1978年   21065篇
  1977年   17764篇
  1976年   16694篇
  1975年   17576篇
  1974年   21488篇
  1973年   20674篇
  1972年   18856篇
  1971年   17776篇
  1970年   16292篇
  1969年   15269篇
  1968年   13949篇
排序方式: 共有10000条查询结果,搜索用时 109 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