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   930580篇
  免费   67500篇
  国内免费   1342篇
耳鼻咽喉   12957篇
儿科学   24358篇
妇产科学   23232篇
基础医学   132889篇
口腔科学   28242篇
临床医学   80531篇
内科学   183233篇
皮肤病学   19226篇
神经病学   72174篇
特种医学   36797篇
外国民族医学   79篇
外科学   152070篇
综合类   18042篇
现状与发展   1篇
一般理论   234篇
预防医学   61735篇
眼科学   21307篇
药学   72523篇
  3篇
中国医学   2164篇
肿瘤学   57625篇
  2018年   8960篇
  2017年   7025篇
  2016年   7758篇
  2015年   8857篇
  2014年   11982篇
  2013年   17494篇
  2012年   24079篇
  2011年   25028篇
  2010年   14798篇
  2009年   14264篇
  2008年   24597篇
  2007年   25683篇
  2006年   26474篇
  2005年   25424篇
  2004年   24554篇
  2003年   23597篇
  2002年   23142篇
  2001年   54724篇
  2000年   56542篇
  1999年   46948篇
  1998年   10730篇
  1997年   9466篇
  1996年   9592篇
  1995年   8926篇
  1994年   8278篇
  1993年   7593篇
  1992年   35487篇
  1991年   33911篇
  1990年   32735篇
  1989年   31869篇
  1988年   28992篇
  1987年   28249篇
  1986年   26289篇
  1985年   25144篇
  1984年   17833篇
  1983年   15141篇
  1982年   7796篇
  1981年   6772篇
  1979年   15782篇
  1978年   10599篇
  1977年   9054篇
  1976年   7871篇
  1975年   8629篇
  1974年   10466篇
  1973年   9858篇
  1972年   9357篇
  1971年   8852篇
  1970年   8426篇
  1969年   7923篇
  1968年   7200篇
排序方式: 共有10000条查询结果,搜索用时 8 毫秒
41.
42.
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   
43.
44.
45.
46.
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   
47.
48.
49.
50.
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