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   2351046篇
  免费   184101篇
  国内免费   4545篇
耳鼻咽喉   31914篇
儿科学   79056篇
妇产科学   66743篇
基础医学   337239篇
口腔科学   68885篇
临床医学   210516篇
内科学   454611篇
皮肤病学   51577篇
神经病学   189815篇
特种医学   92442篇
外国民族医学   753篇
外科学   354619篇
综合类   57926篇
现状与发展   3篇
一般理论   898篇
预防医学   184105篇
眼科学   54525篇
药学   174536篇
  6篇
中国医学   4485篇
肿瘤学   125038篇
  2018年   23018篇
  2016年   20220篇
  2015年   23155篇
  2014年   31891篇
  2013年   48950篇
  2012年   65431篇
  2011年   69279篇
  2010年   41231篇
  2009年   39141篇
  2008年   65851篇
  2007年   69578篇
  2006年   70683篇
  2005年   68419篇
  2004年   67108篇
  2003年   64402篇
  2002年   62762篇
  2001年   107896篇
  2000年   111416篇
  1999年   94188篇
  1998年   26333篇
  1997年   23961篇
  1996年   23734篇
  1995年   23132篇
  1994年   21686篇
  1993年   20411篇
  1992年   77266篇
  1991年   75344篇
  1990年   74055篇
  1989年   71411篇
  1988年   65891篇
  1987年   65495篇
  1986年   61829篇
  1985年   59820篇
  1984年   45005篇
  1983年   38543篇
  1982年   22905篇
  1981年   20570篇
  1980年   19263篇
  1979年   42620篇
  1978年   30058篇
  1977年   25395篇
  1976年   23901篇
  1975年   25144篇
  1974年   30722篇
  1973年   29604篇
  1972年   27160篇
  1971年   25597篇
  1970年   23570篇
  1969年   22080篇
  1968年   20272篇
排序方式: 共有10000条查询结果,搜索用时 11 毫秒
61.
62.
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   
63.
64.
65.
66.
67.
68.
69.
On 8 April 2014, a US jury ordered Takeda and Eli Lilly to pay $9 bn in punitive damages after finding that they had concealed the cancer risks associated with pioglitazone. By contrast, on 28 August 2014, the long‐awaited outcome of the 10‐year Kaiser Permanente Northern California study was announced. That study was specifically designed to investigate whether patients exposed to pioglitazone were at an increased risk of bladder cancer and found no association; thus, at last, the controversial issue has been resolved. A review, in retrospect, of the story of the proposed link between pioglitazone and bladder cancer reveals flaws at every stage. In 2012, a BMJ editorial, in keeping with some other contemporary reports, stated ‘it can confidently be assumed that pioglitazone increases the risk of bladder cancer’. Examination of the information which led to such a statement shows that: 1) the pre‐clinical findings of bladder cancer in male rats is not indicative of human risk; 2) there is no association between bladder cancer and pioglitazone in randomized controlled trials, once cases that could not plausibly be related to treatment are removed; and 3) the observational studies that have suggested a link have over‐extrapolated from the data: pioglitazone‐treated patients had more risk factors for bladder cancer than those not treated with pioglitazone. Meanwhile careful study of randomized controlled trials shows evidence of cardiovascular benefit from pioglitazone in Type 2 diabetes, a condition which results, more than anything, in premature cardiovascular death and morbidity.  相似文献   
70.
While peer support has been investigated in multiple clinical contexts, its application to the postpartum setting is unknown. The aim was to assess acceptability of a postpartum peer support program for women with diabetes. Observational survey-based needs assessment of forty low-income women with diabetes, receiving care at a major medical institution. Mean age and gravidity were 30.7 years and 3.15 ± 1.67 respectively. 45 % expressed interest in a “buddy.” There was no significant difference between groups desiring and not desiring this program. A majority of respondents desired telephone, text messaging, and in-person contacts (79.2, 72.1, 83.8 %), with 72.5 % of patients desiring diabetes-related activities during clinic waiting time. Many women desire a postpartum diabetes reciprocal peer program for support outside of clinician visits. Patients are receptive to educational services during their wait and outside of clinic time, a potentially valuable opportunity to share important health information.  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