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   200386篇
  免费   2246篇
  国内免费   100篇
耳鼻咽喉   1538篇
儿科学   7101篇
妇产科学   3315篇
基础医学   19934篇
口腔科学   2194篇
临床医学   14062篇
内科学   37055篇
皮肤病学   1313篇
神经病学   18117篇
特种医学   9877篇
外国民族医学   1篇
外科学   32887篇
综合类   2446篇
一般理论   2篇
预防医学   18735篇
眼科学   3030篇
药学   11339篇
中国医学   700篇
肿瘤学   19086篇
  2022年   297篇
  2021年   457篇
  2020年   274篇
  2019年   355篇
  2018年   22266篇
  2017年   17652篇
  2016年   19854篇
  2015年   1305篇
  2014年   1392篇
  2013年   1435篇
  2012年   8018篇
  2011年   22113篇
  2010年   19416篇
  2009年   12084篇
  2008年   20468篇
  2007年   22796篇
  2006年   1647篇
  2005年   3347篇
  2004年   4458篇
  2003年   5288篇
  2002年   3441篇
  2001年   1278篇
  2000年   1358篇
  1999年   1052篇
  1998年   517篇
  1997年   415篇
  1996年   325篇
  1995年   288篇
  1994年   257篇
  1993年   244篇
  1992年   663篇
  1991年   629篇
  1990年   656篇
  1989年   601篇
  1988年   563篇
  1987年   520篇
  1986年   481篇
  1985年   457篇
  1984年   331篇
  1983年   276篇
  1982年   182篇
  1979年   247篇
  1978年   166篇
  1977年   188篇
  1973年   178篇
  1972年   186篇
  1971年   190篇
  1970年   191篇
  1969年   206篇
  1968年   187篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
31.
32.
Statutory reimbursement agencies as well as private insurers throughout member states of the Organization for Economic Cooperation and Development (OECD) reimburse the cost of medicines on the basis of criteria that include robust clinical evidence, budget impact analysis, and incremental cost effectiveness. The Centers for Medicare and Medicaid Services (CMS) in the US are no exception to this rule and are, in principle, seeking to maximize benefit for their Medicare enrollees, whilst ensuring reasonable drug outlays for the small number of drugs that they reimburse. This paper provides a retrospective analysis of the way two functionally equivalent drugs are treated for reimbursement purposes by the CMS; the period under consideration was 2001–3. The two drugs, epoetin-α and darbepoetin-α, are used for the treatment of anemia in renal failure and in patients receiving chemotherapy. By reviewing the publicly available pharmacological and clinical data of epoetin-α and darbepoetin-α, the paper confirms the two drugs’ functional equivalence, despite their structural differences. The implications of dose conversion ratios and costs to Medicare are subsequently explored. It is argued that the issue of dose equivalence between epoetin-α and darbepoetin-α has significant implications for patients, practitioners, and payors. A payor’s perspective is adopted in this respect, whereby clinical evidence and pricing data are used simultaneously. Based on the clinical evidence, a dose conversion ratio for epoetin-α:darbepoetin-α is established, which achieves a comparable clinical effect for the two drugs and this is set to be <254IU:1μg. The incremental costs to Medicare are calculated subsequently. The Average Wholesale Price and the Outpatient Prospective Payment System rule that Medicare uses to reimburse providers are used and suggest that treatment of cancer patients with chemotherapy-related anemia with epoetin-α would save Medicare an estimated $US600 million each year. Patients would also benefit significantly in terms of lower co-payments for epoetin-α. The evidence is supportive of the decision made by the CMS to reimburse the two drugs at the rate reflecting the achievement of comparable clinical effects and therefore reducing the pass-through payments for darbepoetin-α to zero for the 2002–3 fiscal year.  相似文献   
33.
34.
35.
36.
37.
Abstract We report a case of SMV injury in a critically ill patient. The patient was a 19-year-old woman involved in a motor vehicle collision. Her injuries included grade II splenic and renal lacerations, devascularized and lacerated right and transverse colon, a transected transverse mesocolon, a massive shear injury of her abdominal wall, and two partial SMV transections. At initial damage control laparotomy, the SMV was ligated, the devascularized bowel resected and a temporary abdominal closure applied. At re-operation, a mesocaval shunt using saphenous vein was employed. The shunt failed and the patient required a saphenous vein jump graft. Although visceral vascular injuries are rare, ligation of the SMV in a damage control situation is acceptable. This case study is the first to discuss appropriate treatment when interruption to a patient's collateral visceral venous drainage limits the surgeon’s ability to ligate. In these situations, bypass shunts may be successful.  相似文献   
38.
For persons battling HIV/AIDS a stable place to live may decide the length and quality of life itself. It is nearly impossible for a person on the streets to engage in a needed continuous AIDS treatment regimen when the very basic question of where that person will rest his or her head when darkness comes in just a few hours is unresolved. When danger lurks on the streets, when cold numbs the limbs, when tiredness overwhelms the mind, when fear breaks the spirit, a place to call home would make all the difference.  相似文献   
39.
40.
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