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   1896899篇
  免费   126953篇
  国内免费   2612篇
耳鼻咽喉   25848篇
儿科学   61112篇
妇产科学   50225篇
基础医学   278889篇
口腔科学   51071篇
临床医学   169930篇
内科学   367746篇
皮肤病学   41590篇
神经病学   148786篇
特种医学   70410篇
外国民族医学   405篇
外科学   283713篇
综合类   37991篇
现状与发展   10篇
一般理论   676篇
预防医学   146414篇
眼科学   43782篇
药学   140303篇
  47篇
中国医学   3673篇
肿瘤学   103843篇
  2021年   15644篇
  2019年   16218篇
  2018年   21878篇
  2017年   16377篇
  2016年   18390篇
  2015年   20559篇
  2014年   29062篇
  2013年   43254篇
  2012年   59938篇
  2011年   63635篇
  2010年   37842篇
  2009年   35751篇
  2008年   59785篇
  2007年   63596篇
  2006年   64293篇
  2005年   62393篇
  2004年   59622篇
  2003年   57139篇
  2002年   55542篇
  2001年   87298篇
  2000年   89350篇
  1999年   74920篇
  1998年   21599篇
  1997年   19007篇
  1996年   19404篇
  1995年   18249篇
  1994年   16788篇
  1993年   15820篇
  1992年   57654篇
  1991年   56157篇
  1990年   54811篇
  1989年   52615篇
  1988年   48378篇
  1987年   47275篇
  1986年   44174篇
  1985年   42230篇
  1984年   31289篇
  1983年   26792篇
  1982年   16031篇
  1979年   28607篇
  1978年   20435篇
  1977年   16948篇
  1976年   16255篇
  1975年   17416篇
  1974年   20866篇
  1973年   19761篇
  1972年   18576篇
  1971年   17622篇
  1970年   16265篇
  1969年   15538篇
排序方式: 共有10000条查询结果,搜索用时 78 毫秒
71.

Aims

To obtain an overview of the management and outcomes of children aged 18 years or younger diagnosed with differentiated thyroid carcinoma of follicular cell origin across the UK, by collecting and analysing data from the limited number of centres treating these patients. This multicentre data might provide a more realistic perspective than single-institution series.

Materials and methods

Six centres submitted data extracted from historical records on patients aged 18 years or younger, diagnosed between 1964 and 2017. The univariate and multivariable Cox proportional hazard model was used to identify potential predictors of progression-free survival, using national data as a control.

Results

Data on 166 patients were available for analysis. Females (74%) were predominant, and the age ranged from 3 to 19 years at diagnosis, mean 14.1 years. Nodal metastases were present in 51%; 12% had distant metastases. After surgery, 95% received radioactive iodine (39% on more than one occasion) and 4% received external beam radiotherapy. With a median follow-up duration of 5 years, 69% are alive with no evidence of disease; 20% are alive with a raised thyroglobulin level as the only evidence of residual disease; 6% have residual structural disease detectable on imaging; 2% have died, from cerebral metastases.

Conclusion

Despite most patients having advanced disease at presentation, outcomes are very good. A national prospective registry should allow systematic collection of good-quality data and may facilitate research to further improve outcomes.  相似文献   
72.

Introduction

Malignant pleural mesothelioma (MPM) is an uncommon cancer with a poor prognosis and heterogeneous survival. Surgery for MPM is offered in some specialist centers to highly selected patients. A previously described classification and regression tree (CART) model stratified survival in unselected MPM patients using routinely collected clinical data. This study aimed to examine the performance of this CART model on a highly selected surgical population.

Methods

Data were collected from subjects undergoing cytoreductive surgery for MPM from specialist centers in Hyõgo, Japan, and Sydney, Australia, between 1991 and 2016. The CART model was applied using the combination of clinical variables to stratify subjects into risk groups (1 through 4); survival characteristics were then compared.

Results

Two hundred eighty-nine cases were included (205 from Australia, 84 from Japan). Overall median survival was 34.6 (interquartile range: 17.5–56.1) months; median age was 63.0 (interquartile range: 57.0–67.8) years, and 83.0% (n = 240) were male. There were no clinically meaningful differences between the two cohorts. Survival across the four risk groups was significantly different (p < 0.0001); the model stratified survival well with a Harrell's concordance statistic of 0.62 (95% confidence interval: 0.57–0.66) at 36 months. The group with the longest survival (median, 82.5 months) had: no weight loss, hemoglobin > 153 g/L and serum albumin > 43 g/L at time of referral to the surgical center.

Conclusions

Using routinely available clinical variables, the CART model was able to stratify surgical patients into risk groups with statistically different survival characteristics with fair to good performance. Presence of weight loss, anemia, and low albumin should confer caution when considering surgical therapy for MPM.  相似文献   
73.
74.
75.
76.
77.
78.
79.
80.
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