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   2479054篇
  免费   203051篇
  国内免费   4524篇
耳鼻咽喉   35744篇
儿科学   75684篇
妇产科学   65517篇
基础医学   350766篇
口腔科学   71952篇
临床医学   222002篇
内科学   490351篇
皮肤病学   51068篇
神经病学   209837篇
特种医学   98303篇
外国民族医学   886篇
外科学   372039篇
综合类   56783篇
现状与发展   1篇
一般理论   998篇
预防医学   204678篇
眼科学   58197篇
药学   186236篇
  4篇
中国医学   4868篇
肿瘤学   130715篇
  2018年   28137篇
  2017年   21248篇
  2016年   23011篇
  2015年   26088篇
  2014年   36617篇
  2013年   55359篇
  2012年   76715篇
  2011年   80704篇
  2010年   46598篇
  2009年   43949篇
  2008年   75373篇
  2007年   80066篇
  2006年   80557篇
  2005年   78268篇
  2004年   74954篇
  2003年   72082篇
  2002年   71008篇
  2001年   114338篇
  2000年   118614篇
  1999年   99963篇
  1998年   28248篇
  1997年   25768篇
  1996年   25669篇
  1995年   24817篇
  1994年   23329篇
  1993年   21714篇
  1992年   80357篇
  1991年   77262篇
  1990年   74492篇
  1989年   71647篇
  1988年   66593篇
  1987年   65520篇
  1986年   62160篇
  1985年   59081篇
  1984年   44692篇
  1983年   38026篇
  1982年   23051篇
  1981年   20461篇
  1979年   41899篇
  1978年   29364篇
  1977年   24703篇
  1976年   23165篇
  1975年   24399篇
  1974年   30254篇
  1973年   28740篇
  1972年   26861篇
  1971年   24795篇
  1970年   23331篇
  1969年   21715篇
  1968年   19784篇
排序方式: 共有10000条查询结果,搜索用时 468 毫秒
101.

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   
102.
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   
103.
104.
Hailey–Hailey disease (HHD), also known as benign familial pemphigus, is an autosomal dominant skin condition that affects the adhesion of epidermal keratinocytes. Although the initial manifestation of flaccid vesicles on erythematous or normal skin in flexure sites frequently goes unnoticed, large, macerated, exudative plaques of superficial erosions with crusting are observed at the time of diagnosis. There is no specific treatment for HHD, and most cases are symptomatically supported. However, infrared laser ablation has been somewhat helpful. We present a case successfully treated with fractional CO2 laser showing a long-term favourable outcome and no adverse effects. Thus, this modality could be an alternative to full ablation for this condition.  相似文献   
105.
106.
107.
108.
109.
Gangliocytic paragangliomas are rare tumors that almost exclusively occur within the second portion of the duodenum. Although these tumors generally have a benign clinical course, they have the potential to recur or metastasize to regional lymph nodes. The case report presented here describes a 57-year-old female patient with melena, progressive asthenia, anemia, and a mass in the second-third portion of the duodenum that was treated by local excision. The patient was diagnosed with a friable bleeding tumor. The histologic analysis showed that the tumor was a 4 cm gangliocytic paraganglioma without a malignant cell pattern. In the absence of local invasion or distant metastasis, endoscopic resection represents a feasible, curative therapy. Although endoscopic polypectomy is currently considered the treatment of choice, it is not recommended if the size of the tumor is > 3 cm and/or there is active or recent bleeding. Patients diagnosed with a gangliocytic paraganglioma should be closely followed-up for possible local recurrence.  相似文献   
110.
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