首页 | 官方网站   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   7186篇
  免费   650篇
  国内免费   14篇
医药卫生   7850篇
  2022年   48篇
  2021年   114篇
  2020年   72篇
  2019年   112篇
  2018年   132篇
  2017年   90篇
  2016年   93篇
  2015年   106篇
  2014年   173篇
  2013年   244篇
  2012年   286篇
  2011年   316篇
  2010年   202篇
  2009年   175篇
  2008年   303篇
  2007年   303篇
  2006年   222篇
  2005年   286篇
  2004年   285篇
  2003年   253篇
  2002年   257篇
  2001年   242篇
  2000年   223篇
  1999年   213篇
  1998年   125篇
  1997年   131篇
  1996年   121篇
  1995年   112篇
  1994年   109篇
  1993年   76篇
  1992年   195篇
  1991年   194篇
  1990年   185篇
  1989年   182篇
  1988年   184篇
  1987年   162篇
  1986年   153篇
  1985年   151篇
  1984年   103篇
  1983年   107篇
  1982年   79篇
  1981年   71篇
  1980年   63篇
  1979年   72篇
  1978年   76篇
  1977年   49篇
  1976年   35篇
  1972年   39篇
  1969年   30篇
  1967年   28篇
排序方式: 共有7850条查询结果,搜索用时 15 毫秒
1.
2.
3.
4.
5.
6.
7.
8.
OBJECTIVE: To evaluate the relative risk for peptic ulcer disease that is associated with the use of nonaspirin nonsteroidal anti-inflammatory drugs. DESIGN: Nested case-control study. SETTING: Tennessee Medicaid program. PARTICIPANTS: Medicaid enrollees 65 years of age or older were included in the study. The 1415 case patients had been hospitalized for confirmed peptic ulcer disease at some point from 1984 through 1986. The 7063 control persons represented a stratified random sample of other Medicaid enrollees. MEASUREMENTS AND MAIN RESULTS: The estimated relative risk for the development of peptic ulcer disease among current users of nonaspirin nonsteroidal anti-inflammatory drugs, compared with that among nonusers, was 4.1 (95% CI, 3.5 to 4.7). For current users, the risk increased with increasing dose, from a relative risk of 2.8 (CI, 1.8 to 4.3) for the lowest to a relative risk of 8.0 (CI, 4.4 to 14.8) for the highest dose category. The risk was greatest in the first month of use (relative risk, 7.2; CI, 4.9 to 10.5). If the association is fully causal, 29% of peptic ulcers in the study sample resulted from the use of these drugs, and the excess risk associated with such use was 17.4 hospitalizations for ulcer disease per 1000 person-years of exposure. CONCLUSIONS: These data support other findings indicating that a clinically significant risk for serious ulcer disease is associated with the use of nonaspirin nonsteroidal anti-inflammatory drugs. The data show that this risk increases with dose and recency of use and that use of these drugs may be responsible for a large proportion of peptic ulcer disease among elderly persons.  相似文献   
9.
This is the third report of a metabolic study on 56 long-term users (24 for 2-5 yr; 32 for over 5 yr) of the injectable contraceptive norethisterone enanthate (Net-En) and deals with the effects on the blood levels of lipoprotein fractions. There was no significant difference between this group and a group of 30 non-users in serum concentrations of triglycerides, total cholesterol, low density and very low density lipoproteins. There was a significant reduction in mean high density lipoprotein levels between the controls and the user groups (16% for the intermediate duration and 12% for the longer duration). Age, ethnic group, body-mass index and a close family history of cardiovascular disease were taken into account, as were various lifestyle factors: diet, exercise, alcohol consumption and smoking. In a smaller group, levels of apoproteins A and B were also assayed. There was a significant reduction in apoprotein A between controls and all users, but the significance was lost on adjusting for confounding variables. Consideration was given to the ratio of total cholesterol to high density lipoprotein cholesterol as an index of coronary risk. There were no significant differences in the total cholesterol:HDL-C ratio between controls and user groups. There was a significant interaction with ethnic group (Caucasian or Afro-Caribbean) in the response to duration of use.  相似文献   
10.
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-23

京公网安备 11010802026262号