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   1616730篇
  免费   135017篇
  国内免费   3139篇
耳鼻咽喉   21821篇
儿科学   53191篇
妇产科学   46735篇
基础医学   229964篇
口腔科学   47564篇
临床医学   142832篇
内科学   318173篇
皮肤病学   34301篇
神经病学   131122篇
特种医学   65148篇
外国民族医学   477篇
外科学   246268篇
综合类   41153篇
现状与发展   6篇
一般理论   548篇
预防医学   123719篇
眼科学   37129篇
药学   122709篇
  8篇
中国医学   3544篇
肿瘤学   88474篇
  2018年   15331篇
  2016年   13372篇
  2015年   15667篇
  2014年   21424篇
  2013年   32248篇
  2012年   43877篇
  2011年   46190篇
  2010年   27180篇
  2009年   25995篇
  2008年   44035篇
  2007年   46289篇
  2006年   47130篇
  2005年   45739篇
  2004年   44973篇
  2003年   42908篇
  2002年   42019篇
  2001年   76129篇
  2000年   78749篇
  1999年   66786篇
  1998年   17907篇
  1997年   16515篇
  1996年   16464篇
  1995年   16122篇
  1994年   15169篇
  1993年   14287篇
  1992年   55601篇
  1991年   53932篇
  1990年   52693篇
  1989年   50956篇
  1988年   47314篇
  1987年   46643篇
  1986年   44352篇
  1985年   42896篇
  1984年   32066篇
  1983年   27591篇
  1982年   16178篇
  1981年   14467篇
  1980年   13588篇
  1979年   30484篇
  1978年   21085篇
  1977年   17779篇
  1976年   16702篇
  1975年   17587篇
  1974年   21493篇
  1973年   20682篇
  1972年   18862篇
  1971年   17780篇
  1970年   16293篇
  1969年   15272篇
  1968年   13955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.
In HIV/AIDS research, few studies to date have evaluated ways to improve parental HIV disclosure practices using feedback from HIV-negative children who have recently experienced this event. We conducted semi-structured in-depth interviews with 20 children (aged 6–15) who were partially to fully aware of their parents’ HIV status in rural Guangxi, China. Of the 20 children, eight children who were of older age (11.38 years in average) endorsed parental HIV disclosure, five discouraged it and seven expressed uncertainty. Children’s different experiences and attitudes towards disclosure were seen to be associated with their family dynamics (especially the parent–child relationship), social support and care, experiences of stigma and discrimination, psychosocial suffering, comprehension of the disease and the children’s age. Our study contributes to building a child-centered comprehensive understanding for Chinese parental HIV disclosure. It is imperative that counselors and community advocates assess and help parents achieve optimal readiness preceding disclosure of their illness to their HIV-negative children.  相似文献   
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