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   40019篇
  免费   3184篇
  国内免费   443篇
耳鼻咽喉   410篇
儿科学   1106篇
妇产科学   672篇
基础医学   5928篇
口腔科学   561篇
临床医学   3923篇
内科学   8974篇
皮肤病学   846篇
神经病学   3093篇
特种医学   1483篇
外国民族医学   16篇
外科学   5009篇
综合类   1297篇
现状与发展   1篇
一般理论   2篇
预防医学   3099篇
眼科学   720篇
药学   2928篇
  6篇
中国医学   627篇
肿瘤学   2945篇
  2023年   274篇
  2022年   603篇
  2021年   1232篇
  2020年   751篇
  2019年   989篇
  2018年   1205篇
  2017年   850篇
  2016年   845篇
  2015年   1075篇
  2014年   1396篇
  2013年   1789篇
  2012年   2632篇
  2011年   2644篇
  2010年   1609篇
  2009年   1356篇
  2008年   2021篇
  2007年   2079篇
  2006年   1998篇
  2005年   1920篇
  2004年   1717篇
  2003年   1656篇
  2002年   1576篇
  2001年   1173篇
  2000年   1147篇
  1999年   1055篇
  1998年   428篇
  1997年   348篇
  1996年   306篇
  1995年   257篇
  1994年   248篇
  1993年   189篇
  1992年   540篇
  1991年   521篇
  1990年   508篇
  1989年   457篇
  1988年   478篇
  1987年   399篇
  1986年   391篇
  1985年   375篇
  1984年   266篇
  1983年   196篇
  1982年   127篇
  1981年   107篇
  1979年   215篇
  1978年   115篇
  1977年   127篇
  1976年   113篇
  1974年   132篇
  1973年   109篇
  1972年   131篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
European Radiology - The strongest adverse prognostic factor in myxoid/round cell liposarcomas (MRC-LPS) is the presence of a round cell component above 5% within the tumor bulk. Its identification...  相似文献   
2.
Introduction: The treatment of classical Hodgkin lymphoma (cHL) in children is a story of success. Nowadays, more than 90% of patients are cured and overall survival is nearly 100% at 5 years. Efforts have been made to avoid related effects of therapies; therefore, children are treated using different chemotherapy schemes in comparison with adults.

Areas covered: This review includes a view of the clinical classification and risk assessment in children suffering from HL. The chemotherapy more commonly employed is revisited. The use of PET/CT to evaluate the disease in order to guide therapy is analyzed. New options of chemotherapy and emerging immunotherapy are also included.

Expert opinion: In order to make the right treatment choice, a proper initial assessment of risk is mandatory. The choice of therapy in these kinds of patients must be done according to the experience of the team, and also, the cost and logistics related to the eligible scheme are very important. If possible, efforts must be made to include PET/CT in guiding therapy and avoiding overtreatment and long-term adverse effects in children. New options in immunotherapy are emerging and must be considered with caution in selected patients.  相似文献   

3.
4.
Abstract

Gaining a better grasp on factors related to changes in alcohol use is of particular interest for clinicians. Past research has highlighted a negative link between future time perspective (i.e. a disposition guiding how individuals consider and act regarding their future) and alcohol misuse. However, much remains at stake in the understanding of this association. The objective of this research was to explore bidirectional relationships between future time perspective and severity of alcohol-related problems, in a clinical setting. The sample includes 79 patients followed up in an outpatient alcohol treatment centre. Two measurement times were planned: at entry into care and 6 months later. Multiple linear regression analyses were carried out, controlling for sociodemographic variables. We found that baseline future time perspective predicted level of alcohol-related problems after 6 months in treatment, even when effects of baseline alcohol-related problems and sociodemographic variables were controlled. This study shows that the way patients see and position themselves regarding their future can affect level of alcohol-related problems. It may be useful for clinicians to identify patients with low future time perspective to offer tailored interventions and consider this dimension as a resource for change.  相似文献   
5.
6.
7.
8.

Objective

To systematically review literature on uptake and timeliness of diphtheria-tetanus-pertussis, measles-mumps-rubella, and/or polio-containing vaccines in infants who were born preterm, with a low birth weight, and/or with chronic health conditions that were diagnosed within the first 6?months of life.

Methods

Using a standardized search strategy developed by a medical librarian, records were extracted from MEDLINE, Embase, Database of Abstracts of Reviews of Effects, and CINAHL up to May 8, 2018.

Results

Out of the 1997 records that were screened, we identified 21 studies that met inclusion criteria. Eleven studies assessed vaccine coverage and/or timeliness in preterm infants, 6 in low birth weight infants, and 7 in children with chronic health conditions. Estimates of coverage in these populations were highly variable, ranging from 40% to 100% across the vaccines and population groups.

Conclusions

There is a lack of studies reporting coverage and timeliness of routine immunizations in special populations of children.

Policy implications

Our review suggests a need for improved surveillance of immunization status in special populations of infants, as well as a need for standardization of reporting practices.  相似文献   
9.
10.
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