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   1603203篇
  免费   131368篇
  国内免费   2584篇
耳鼻咽喉   21693篇
儿科学   53007篇
妇产科学   46278篇
基础医学   227918篇
口腔科学   47205篇
临床医学   141073篇
内科学   315028篇
皮肤病学   34136篇
神经病学   130222篇
特种医学   64751篇
外国民族医学   474篇
外科学   243996篇
综合类   39793篇
现状与发展   3篇
一般理论   549篇
预防医学   122961篇
眼科学   36477篇
药学   121305篇
  3篇
中国医学   2975篇
肿瘤学   87308篇
  2018年   14792篇
  2016年   12915篇
  2015年   15037篇
  2014年   20677篇
  2013年   31383篇
  2012年   42610篇
  2011年   44830篇
  2010年   26379篇
  2009年   25336篇
  2008年   43048篇
  2007年   45289篇
  2006年   46114篇
  2005年   44717篇
  2004年   44133篇
  2003年   42212篇
  2002年   41325篇
  2001年   75716篇
  2000年   78372篇
  1999年   66407篇
  1998年   17747篇
  1997年   16344篇
  1996年   16324篇
  1995年   16033篇
  1994年   15080篇
  1993年   14227篇
  1992年   55472篇
  1991年   53819篇
  1990年   52594篇
  1989年   50865篇
  1988年   47253篇
  1987年   46577篇
  1986年   44307篇
  1985年   42873篇
  1984年   32068篇
  1983年   27574篇
  1982年   16155篇
  1981年   14441篇
  1980年   13577篇
  1979年   30480篇
  1978年   21073篇
  1977年   17772篇
  1976年   16700篇
  1975年   17589篇
  1974年   21495篇
  1973年   20688篇
  1972年   18864篇
  1971年   17783篇
  1970年   16294篇
  1969年   15273篇
  1968年   13957篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
61.
62.
63.
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   
64.
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   
65.
Graefe's Archive for Clinical and Experimental Ophthalmology - Retinal microvascular endothelial dysfunction is thought to be of importance in the development of ocular vascular diseases....  相似文献   
66.
The first COVID-19 vaccination was given in December 2020 and there is an effort to vaccinate the international population on a massive scale. Common side effects from the vaccine include headache and tiredness. Regional lymphadenopathy has been described in relation to other vaccines. We describe two cases of supraclavicular reactive lymphadenopathy presenting in patients who had the COVID vaccination in the ipsilateral arm. Awareness of this diagnosis is important for patients presenting to the neck lump clinic.  相似文献   
67.
68.
Journal of Behavioral Medicine - Understanding associations between mothers’ and children’s physical activity and sedentary behavior on more fine-grained timescales can provide insights...  相似文献   
69.
70.
The aim of this study was to analyse the effect of body mass index (BMI), both low and high values, on the perioperative complication rate in patients with oral squamous cell carcinoma (OSCC). The medical records of 259 patients operated between 2014 and 2017 for OSCC were reviewed. Univariate and multivariate analyses were performed. Sixty of the 259 patients developed 87 complications. Low or high BMI was not associated with the perioperative complication rate. A longer operating time and increased blood loss were associated with a higher perioperative complication rate and higher Clavien–Dindo grade. Low BMI, American Society of Anesthesiologists score 2 and 3, a longer operating time, and increased blood loss were associated with a longer hospital stay. Low BMI was associated with a longer hospital stay. Neither low nor high BMI was associated with the perioperative complication rate. A longer operating time and increased blood loss were associated with a higher perioperative complication rate and higher Clavien–Dindo grade.  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