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   34401篇
  免费   2753篇
  国内免费   418篇
耳鼻咽喉   360篇
儿科学   1013篇
妇产科学   608篇
基础医学   4983篇
口腔科学   523篇
临床医学   3223篇
内科学   7375篇
皮肤病学   762篇
神经病学   2583篇
特种医学   1521篇
外国民族医学   16篇
外科学   4180篇
综合类   1280篇
现状与发展   1篇
一般理论   2篇
预防医学   2621篇
眼科学   683篇
药学   2582篇
  6篇
中国医学   619篇
肿瘤学   2631篇
  2023年   244篇
  2022年   631篇
  2021年   1072篇
  2020年   669篇
  2019年   836篇
  2018年   1035篇
  2017年   749篇
  2016年   735篇
  2015年   904篇
  2014年   1151篇
  2013年   1503篇
  2012年   2179篇
  2011年   2187篇
  2010年   1353篇
  2009年   1121篇
  2008年   1617篇
  2007年   1666篇
  2006年   1590篇
  2005年   1492篇
  2004年   1330篇
  2003年   1266篇
  2002年   1197篇
  2001年   1114篇
  2000年   1101篇
  1999年   979篇
  1998年   362篇
  1997年   320篇
  1996年   277篇
  1995年   224篇
  1994年   229篇
  1993年   191篇
  1992年   519篇
  1991年   501篇
  1990年   481篇
  1989年   455篇
  1988年   474篇
  1987年   406篇
  1986年   389篇
  1985年   384篇
  1984年   277篇
  1983年   200篇
  1982年   131篇
  1981年   122篇
  1979年   213篇
  1978年   122篇
  1977年   130篇
  1976年   120篇
  1974年   131篇
  1972年   128篇
  1969年   104篇
排序方式: 共有10000条查询结果,搜索用时 31 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.
5.
6.

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   
7.
8.
9.
10.
It is hypothesized that persons who use drugs (PWUD) in Vietnam who are also HIV-positive may face additional challenges in psychosocial outcomes, and these challenges may extend to their family members. In this study, we examined depressive symptoms, stigma, social support, and caregiver burden of HIV-positive PWUD and their family members, compared to the outcomes of HIV-negative PWUD and their family members. Baseline, 3-month, and 6-month assessment data were gathered from 83 PWUD and 83 family members recruited from four communes in Phú Th? Province, Vietnam. For PWUD, although we observed a general decline in overall stigma over time for both groups, HIV-positive PWUD consistently reported significantly higher overall stigma for all three periods. Depressive symptoms among family members in both groups declined over time; however, family members of HIV-positive PWUD reported higher depressive symptoms across all three periods. In addition, family members of HIV-positive PWUD reported lower levels of tangible support across all three periods. Caregiver burden among family members of HIV-positive PWUD increased significantly over time, whereas the reported burden among family members of HIV-negative PWUD remained relatively unchanged. The findings highlight the need for future interventions for PWUD and family members, with targeted and culturally specific strategies to focus on the importance of addressing additional stigma experienced by PWUD who are HIV-positive. Such challenges may have direct negative impact on their family members' depressive symptoms, tangible support, and caregiver burden.  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