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   2588112篇
  免费   201998篇
  国内免费   4377篇
耳鼻咽喉   35981篇
儿科学   80323篇
妇产科学   66921篇
基础医学   359349篇
口腔科学   69783篇
临床医学   231070篇
内科学   507592篇
皮肤病学   49263篇
神经病学   220501篇
特种医学   105870篇
外国民族医学   886篇
外科学   396695篇
综合类   59407篇
现状与发展   2篇
一般理论   1038篇
预防医学   211469篇
眼科学   58975篇
药学   189906篇
  4篇
中国医学   5034篇
肿瘤学   144418篇
  2018年   46007篇
  2017年   36105篇
  2016年   40584篇
  2015年   24949篇
  2014年   35436篇
  2013年   53355篇
  2012年   77592篇
  2011年   94953篇
  2010年   61477篇
  2009年   53303篇
  2008年   90436篇
  2007年   97760篇
  2006年   77064篇
  2005年   77258篇
  2004年   75960篇
  2003年   74800篇
  2002年   71979篇
  2001年   113172篇
  2000年   117411篇
  1999年   98978篇
  1998年   28625篇
  1997年   26277篇
  1996年   25999篇
  1995年   25160篇
  1994年   23706篇
  1993年   21992篇
  1992年   79750篇
  1991年   76774篇
  1990年   73949篇
  1989年   71163篇
  1988年   66170篇
  1987年   65104篇
  1986年   61608篇
  1985年   58707篇
  1984年   44639篇
  1983年   38002篇
  1982年   23361篇
  1981年   20744篇
  1980年   19541篇
  1979年   41583篇
  1978年   29274篇
  1977年   24576篇
  1976年   23070篇
  1975年   24155篇
  1974年   29876篇
  1973年   28188篇
  1972年   26368篇
  1971年   24275篇
  1970年   22861篇
  1969年   21192篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
91.
92.

Purpose

Chest wall pain is an uncommon but bothersome late complication following lung stereotactic body radiation therapy. Despite numerous studies investigating predictors of chest wall pain, no clear consensus has been established for a chest wall constraint. The aim of our study was to investigate factors related to chest wall pain in a homogeneous group of patients treated at our institution.

Patients and methods

All 122 patients were treated with the same stereotactic body radiation therapy regimen of 48 Gy in three fractions, seen for at least 6 months of follow-up, and planned with heterogeneity correction. Chest wall pain was scored according to the Common Terminology Criteria for Adverse Events classification v3.0. Patient (age, sex, diabetes, osteoporosis), tumour (planning target volume, volume of the overlapping region between planning target volume and chest wall) and chest wall dosimetric parameters (volumes receiving at least 30, 40, and 50 Gy, the minimal doses received by the highest irradiated 1, 2, and 5 cm3, and maximum dose) were collected. The correlation between chest wall pain (grade 2 or higher) and the different parameters was evaluated using univariate and multivariate logistic regression.

Results

Median follow-up was 18 months (range: 6–56 months). Twelve patients out of 122 developed chest wall pain of any grade (seven with grade 1, three with grade 2 and two with grade 3 pain). In univariate analysis, only the volume receiving 30 Gy or more (P = 0.034) and the volume of the overlapping region between the planning target volume and chest wall (P = 0.038) significantly predicted chest wall pain, but these variables were later proved non-significant in multivariate regression.

Conclusion

Our analysis could not find any correlation between the studied parameters and chest wall pain. Considering our present study and the wide range of differing results from the literature, a reasonable conclusion is that a constraint for chest wall pain is yet to be defined.  相似文献   
93.
To evaluate the changes in alveolar contour after guided bone regeneration (GBR) with two different combinations of biomaterials in dehiscence defects arou  相似文献   
94.
95.
96.
97.
98.
99.
100.
Porocarcinoma is an unusual, locally aggressive and potentially fatal neoplasm. Several cutaneous malignancies have been described in association with porocarcinoma, including squamous cell carcinoma, basal cell carcinoma and tricholemmal carcinoma. Previous reports have indicated that the occurrence of malignant tumours in combination with porocarcinoma is extremely rare, in particular with regard to Bowen disease (BD). We report an uncommon case of porocarcinoma occurring synchronously in a single BD lesion in a 63‐year‐old woman with multiple BD lesions. The clinical and histological findings confirmed this diagnosis.  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