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   2938850篇
  免费   233295篇
  国内免费   5875篇
耳鼻咽喉   42591篇
儿科学   91306篇
妇产科学   80658篇
基础医学   413821篇
口腔科学   83978篇
临床医学   263899篇
内科学   576963篇
皮肤病学   60403篇
神经病学   245256篇
特种医学   117800篇
外国民族医学   1129篇
外科学   449207篇
综合类   68510篇
现状与发展   1篇
一般理论   1169篇
预防医学   233396篇
眼科学   69244篇
药学   218445篇
  4篇
中国医学   5556篇
肿瘤学   154684篇
  2018年   29943篇
  2016年   25486篇
  2015年   28820篇
  2014年   41535篇
  2013年   63463篇
  2012年   85476篇
  2011年   90279篇
  2010年   53556篇
  2009年   51409篇
  2008年   86016篇
  2007年   91341篇
  2006年   92216篇
  2005年   90045篇
  2004年   86536篇
  2003年   83699篇
  2002年   82508篇
  2001年   135217篇
  2000年   139568篇
  1999年   118237篇
  1998年   34086篇
  1997年   31053篇
  1996年   30824篇
  1995年   29609篇
  1994年   27810篇
  1993年   26032篇
  1992年   94837篇
  1991年   91510篇
  1990年   88533篇
  1989年   85334篇
  1988年   79360篇
  1987年   78124篇
  1986年   74339篇
  1985年   70859篇
  1984年   53584篇
  1983年   45727篇
  1982年   27937篇
  1981年   24730篇
  1980年   23299篇
  1979年   50260篇
  1978年   35249篇
  1977年   29866篇
  1976年   28030篇
  1975年   29783篇
  1974年   36472篇
  1973年   34694篇
  1972年   32605篇
  1971年   30124篇
  1970年   28511篇
  1969年   26604篇
  1968年   24527篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
191.
PurposeOur purpose was to determine the effect of chemoradiotherapy (CRT) on patient-reported quality of life (QOL) for patients with intact pancreas cancer.Methods and MaterialsWe reviewed a prospective QOL registry for patients with intact, clinically localized pancreatic ductal adenocarcinoma treated with CRT between June 2015 and November 2018. QOL was assessed pre-CRT (immediately before CRT, after neoadjuvant chemotherapy) and at the completion of CRT with the Functional Assessment of Cancer Therapy-Hepatobiliary (FACT-Hep) and its component parts: FACT-General (FACT-G) and hepatobiliary cancer subscore (HCS). A minimally important difference from pre-CRT was defined as ≥ 6, 5, and 8 points for FACT-G, HCS, and FACT-Hep, respectively.ResultsOf 157 patients who underwent CRT, 100 completed both pre- and post-CRT surveys and were included in the primary analysis. Median age at diagnosis was 65 years (range, 23-90). National Comprehensive Cancer Network resectability status was resectable (3%), borderline resectable (40%), or locally advanced (57%). Folinic acid, 5-fluorouracil, irinotecan, and oxaliplatin (FOLFIRINOX) (75%) or gemcitabine and nab-paclitaxel (42%) were given for a median of 6 cycles (range, 0-42) before CRT. Radiation therapy techniques included 3-dimensional conformal (22%), intensity modulated photon (55%), and intensity modulated proton (23%) radiation therapy to a median dose of 50 Gy (range, 36-62.5). Concurrent chemotherapy was most commonly capecitabine (82%). Sixty-three patients (63%) had surgery after CRT. The mean decline in FACT-G, HCS subscale, and FACT-Hep from pre- to post-CRT was 3.5 (standard deviation [SD], 13.7), 1.7 (SD 7.8), and 5.2 (SD 19.4), respectively. Each of these changes were statistically significant, but did not meet the minimally important difference threshold. Pancreatic head tumor location was associated with decline in FACT-Hep. Nausea was the toxicity with the greatest increase from pre- to post-CRT by both physician-assessment and patient-reported QOL.ConclusionsFor patients with intact pancreatic adenocarcinoma, modern CRT is well tolerated with minimal decline in QOL during treatment.  相似文献   
192.
193.
194.
Psoriasis is a chronic, inflammatory, immune‐mediated disease. Approximately 30% of patients have disease onset before age 18 years. Psoriasis in children and adolescents may be difficult to control, with subsequent poor quality of life and psychosocial consequences. We describe the case of a 12‐year‐old boy with severe, refractory, chronic plaque psoriasis for 6 years. Various therapeutic regimens including different topical corticosteroids, topical vitamin D analogs, phototherapy, photochemotherapy, systemic therapy with methotrexate, cyclosporin, and combination therapies showed only partial or transient responses with frequent relapses. Because anti‐interleukin‐12/23 agents have been successfully used in adults with psoriasis, ustekinumab was initiated and our patient showed a rapid, excellent, sustained response. No recurrence or flares have been observed after 33 months of follow‐up. This case illustrates that ustekinumab may be an effective and safe therapeutic option in adolescents with psoriasis.  相似文献   
195.
We report a case of intestinal obstruction in a 73-year-old woman caused by ileocolic intussusception. The underlying cause was a giant submucosal ulcerating lipoma (6?×?3.3?×?3.8 cm) extending from the superior mucosal lip of Bauhin’s valve. Abdominal ultrasonography showed a pathognomonic target-like mass appearing as multiple concentric rings. CT scan confirmed the diagnosis. Because of apparent obstruction, a laparotomy with right hemicolectomy and ileocolic anastomosis was performed. Lipomas most frequently occur in the cecum and ascending colon where they represent the most common submucosal mesenchymal tumor. They typically occur in elderly women with an incidence that varies from 0.15 to 0.56 %. Pain, rectal bleeding, and obstruction are typical symptoms. When faced with an intussusception in children, reduction with air per rectum can be performed. In adults, however, malignant cell spreading and seeding is of big concern. Since approximately 20–50 % of all underlying causes are malignant, explorative surgery is favored in adults.  相似文献   
196.
197.
198.
199.
200.
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