全文获取类型
收费全文 | 539469篇 |
免费 | 35794篇 |
国内免费 | 849篇 |
专业分类
耳鼻咽喉 | 7258篇 |
儿科学 | 17431篇 |
妇产科学 | 14466篇 |
基础医学 | 88323篇 |
口腔科学 | 15040篇 |
临床医学 | 47180篇 |
内科学 | 98876篇 |
皮肤病学 | 12641篇 |
神经病学 | 37884篇 |
特种医学 | 19382篇 |
外国民族医学 | 63篇 |
外科学 | 80859篇 |
综合类 | 9130篇 |
现状与发展 | 2篇 |
一般理论 | 125篇 |
预防医学 | 40767篇 |
眼科学 | 12590篇 |
药学 | 42476篇 |
中国医学 | 1126篇 |
肿瘤学 | 30493篇 |
出版年
2018年 | 5600篇 |
2016年 | 4552篇 |
2015年 | 5158篇 |
2014年 | 6964篇 |
2013年 | 10782篇 |
2012年 | 14796篇 |
2011年 | 16216篇 |
2010年 | 9452篇 |
2009年 | 8718篇 |
2008年 | 15249篇 |
2007年 | 16349篇 |
2006年 | 16460篇 |
2005年 | 15863篇 |
2004年 | 15352篇 |
2003年 | 14556篇 |
2002年 | 14351篇 |
2001年 | 24823篇 |
2000年 | 25724篇 |
1999年 | 21114篇 |
1998年 | 5682篇 |
1997年 | 4891篇 |
1996年 | 5219篇 |
1995年 | 4776篇 |
1994年 | 4463篇 |
1992年 | 16038篇 |
1991年 | 16570篇 |
1990年 | 16673篇 |
1989年 | 16021篇 |
1988年 | 14766篇 |
1987年 | 14618篇 |
1986年 | 13777篇 |
1985年 | 13127篇 |
1984年 | 9764篇 |
1983年 | 8373篇 |
1982年 | 4636篇 |
1981年 | 4316篇 |
1979年 | 9522篇 |
1978年 | 6947篇 |
1977年 | 5852篇 |
1976年 | 5675篇 |
1975年 | 6464篇 |
1974年 | 7719篇 |
1973年 | 7189篇 |
1972年 | 7042篇 |
1971年 | 6752篇 |
1970年 | 6217篇 |
1969年 | 5933篇 |
1968年 | 5578篇 |
1967年 | 5033篇 |
1966年 | 4470篇 |
排序方式: 共有10000条查询结果,搜索用时 677 毫秒
41.
42.
43.
44.
45.
46.
R.D. Olmos R.C. de Figueiredo E.M. Aquino P.A. Lotufo I.M. Bensenor 《Brazilian journal of medical and biological research》2015,48(8):751-758
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
47.
Hsien-Chi Liao Jen-Hao Chuang Hsao-Hsun Hsu Ke-Cheng Chen Jin-Shing Chen 《Surgical endoscopy》2020,34(4):1641-1647
Thoracic empyema in uremic patients on maintenance hemodialysis is a challenging situation. The clinical characteristics are rarely reported, and the surgical outcomes remain unclear. We report our experience with video-assisted thoracoscopic surgery in these patients during 10-year period of time. Between 2005 and 2015, we retrospectively reviewed the clinical characteristics, bacteriological studies, and thoracoscopic surgical results of 23 empyema patients undergoing maintenance hemodialysis. The mean patient age was 67.1 ± 12.9 years. All patients had additional preexisting systemic diseases. The mean duration of hemodialysis was 34.7 ± 25.8 months. The infections causing empyema were pneumonia in 11 (47.8%), blood stream infection in 8 (34.8%), and uremic pleuritis in 4 (17.4%). Among the 22 identified microorganisms, the most common pathogen was methicillin-resistant Staphylococcus aureus (31.8%). After thoracoscopic surgery, 8 patients (34.8%) required additional procedures for complications, including 2 patients who required repeated thoracoscopy for hemothorax and 6 (26.1%) patients who required open drainage for residual empyema. The mean hospital stay was 62.4 days, and 6 patients (26.1%) died in the hospital. Univariate and multivariate analyses revealed that maintenance hemodialysis longer than 5 years was a significant factor associated with in-hospital mortality (odds ratio: 14.8, 95% confidence interval 1.5–151.6; p < 0.0001). While surgical management of thoracic empyema in uremic patients undergoing maintenance hemodialysis is associated with high rates of complication and mortality, thoracoscopic surgery is feasible, especially for patients undergoing hemodialysis for less than 5 years. 相似文献
48.
A novel BRAF mutation in association with primary amelanotic melanoma with oral metastases
下载免费PDF全文
![点击此处可从《Journal of the European Academy of Dermatology and Venereology》网站下载免费的PDF全文](/ch/ext_images/free.gif)
49.