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   61383篇
  免费   3967篇
  国内免费   119篇
耳鼻咽喉   558篇
儿科学   2576篇
妇产科学   1681篇
基础医学   7705篇
口腔科学   658篇
临床医学   8949篇
内科学   10705篇
皮肤病学   904篇
神经病学   6331篇
特种医学   1289篇
外国民族医学   2篇
外科学   5092篇
综合类   727篇
一般理论   109篇
预防医学   8433篇
眼科学   806篇
药学   3945篇
中国医学   61篇
肿瘤学   4938篇
  2023年   326篇
  2022年   452篇
  2021年   1082篇
  2020年   752篇
  2019年   1119篇
  2018年   1282篇
  2017年   1037篇
  2016年   1126篇
  2015年   1327篇
  2014年   1817篇
  2013年   2890篇
  2012年   4212篇
  2011年   4496篇
  2010年   2509篇
  2009年   2246篇
  2008年   4082篇
  2007年   4350篇
  2006年   4163篇
  2005年   4299篇
  2004年   4100篇
  2003年   3857篇
  2002年   3558篇
  2001年   648篇
  2000年   507篇
  1999年   617篇
  1998年   747篇
  1997年   659篇
  1996年   524篇
  1995年   530篇
  1994年   458篇
  1993年   394篇
  1992年   403篇
  1991年   346篇
  1990年   317篇
  1989年   340篇
  1988年   330篇
  1987年   299篇
  1986年   277篇
  1985年   272篇
  1984年   289篇
  1983年   249篇
  1982年   269篇
  1981年   258篇
  1980年   204篇
  1979年   182篇
  1978年   156篇
  1977年   120篇
  1976年   100篇
  1974年   132篇
  1973年   106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.
Background. The National Heart, Lung, and Blood Institute (NHLBI) guidelines recommend that patients receive a follow-up outpatient asthma visit after being discharged from an emergency department (ED) for asthma. Objective. To measure the frequency of follow-up outpatient asthma visits and its association with repeat ED asthma visit. Design. We conducted a retrospective cohort study of children with asthma using claims data from a university-based managed care organization from 01 1998 to 10 2000. We performed a multivariate survival analysis using Cox proportional hazards model to determine the effect of follow-up outpatient asthma visits on the likelihood of a repeat ED asthma visit, after controlling for severity of illness, patient age, gender, insurance, and the specialty of the primary care provider. Results: A total of 561 children had 780 ED asthma visits. Of these, 103 (17%) had a repeat ED asthma visit within 1 year. Almost two-thirds of children (66%) did not receive outpatient follow-up for asthma within 30 days of an ED asthma visit. Outpatient asthma visits within 30 days of an ED asthma visit are associated with an increased likelihood (relative risk = 1.80; 95% confidence interval 1.19, 2.72) for repeat ED asthma visits within 1 year. Conclusions. Most patients do not have outpatient follow-up after an ED asthma visit. However, those patients that present for outpatient follow-up have an increased likelihood for repeat ED asthma visits. For the primary care provider, these outpatient follow-up visits signal an increased risk that a patient will return to the ED for asthma and are a key opportunity to prevent future ED asthma visits.  相似文献   
97.
Background: Although managed care organizations (MCOs) may be optimal settings for implementing tobacco use cessation clinical guidelines, such guidelines remain poorly implemented in many MCO settings.Purpose: We examined issues related to the implementation of guidelines in MCOs, to provide examples of studies that have addressed issues related to guideline implementation and to suggest ways behavioral medicine researchers can play a role in examining issues of how guidelines can be better implemented.Methods: Surveys of clinical guideline implementation, studies from the Robert Wood Johnson Foundation addressing tobacco use cessation in a managed care database, selected to illustrate issues related to system-wide implementation.Results: Surveys show that effective tobacco use cessation interventions remain underutilized in MCOs. A few studies have evaluated and shown the benefit of insurance coverage for tobacco use and dependence treatments, clinician reimbursement and leadership incentives, practice feedback, and leveraging administrative data to create tobacco use tracking systems. The studies also point to the need for large-scale, multidisciplinary, methodologically rigorous studies that allow one to isolate the effects of promising strategies as well as to explore synergistic effects as different system changes are combined.Conclusions: Tobacco use cessation guidelines need to be better implemented in MCOs. Behavioral medicine research needs to move beyond treatment efficacy and effectiveness studies to focus on rigorous evaluations of these and other strategies to enhance guideline implementation and dissemination. This research was supported by grants from the Tobacco-Related Disease Research Program (Taylor) and from the Robert Wood Johnson Foundation (Taylor and Curry).  相似文献   
98.
99.
100.
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