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   1686298篇
  免费   137642篇
  国内免费   2897篇
耳鼻咽喉   22618篇
儿科学   55044篇
妇产科学   47556篇
基础医学   239686篇
口腔科学   49142篇
临床医学   149698篇
内科学   332349篇
皮肤病学   35645篇
神经病学   139267篇
特种医学   68102篇
外国民族医学   479篇
外科学   255765篇
综合类   40737篇
现状与发展   3篇
一般理论   605篇
预防医学   129678篇
眼科学   37925篇
药学   126819篇
  3篇
中国医学   3069篇
肿瘤学   92647篇
  2018年   16839篇
  2016年   14725篇
  2015年   17138篇
  2014年   23412篇
  2013年   35028篇
  2012年   48215篇
  2011年   50430篇
  2010年   29730篇
  2009年   28446篇
  2008年   47977篇
  2007年   50719篇
  2006年   51156篇
  2005年   49699篇
  2004年   48789篇
  2003年   46369篇
  2002年   45433篇
  2001年   77038篇
  2000年   79574篇
  1999年   67615篇
  1998年   18742篇
  1997年   17123篇
  1996年   16960篇
  1995年   16680篇
  1994年   15631篇
  1993年   14722篇
  1992年   56178篇
  1991年   54480篇
  1990年   53230篇
  1989年   51441篇
  1988年   47774篇
  1987年   47109篇
  1986年   44834篇
  1985年   43437篇
  1984年   32499篇
  1983年   27951篇
  1982年   16559篇
  1981年   14769篇
  1980年   13843篇
  1979年   30809篇
  1978年   21353篇
  1977年   18031篇
  1976年   16898篇
  1975年   17830篇
  1974年   21743篇
  1973年   20929篇
  1972年   19078篇
  1971年   17939篇
  1970年   16483篇
  1969年   15459篇
  1968年   14091篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
81.
82.
83.
84.
A 19-item survey instrument was designed and mailed by the Infectious Diseases Society of America to its membership to determine the media preferred by infectious diseases physicians for continuing medical education on general topics and on antimicrobial resistance. The objective of the survey was to offer the developers of educational programs knowledge on which to base more-effective ways to deliver educational materials to physicians in this specialty.  相似文献   
85.
OBJECTIVE: To assess the effects of adding combined estradiol/norethisterone acetate therapy (CENT) to goserelin acetate treatment (GA) of dysfunctional uterine bleeding (DUB) in perimenopausal women. METHODS: In a randomized, placebo-controlled, double-blind trial followed by an open follow-up study, 31 perimenopausal women with DUB were recruited from gynecological outpatient departments of two Dutch hospitals and randomized for treatment with either GA/placebo or GA/CENT for 6 months followed by 18 months of GA/CENT for all. The main outcome measures were abdominal pain, number of bleeding days, double-layer endometrial thickness (DET), Greene climacteric score (GCS), visual analog scale for well-being, bone mineral density (BMD) and mammographic density (BI-RAD score). RESULTS: Abdominal pain, number of bleeding days and DET decreased in both groups, the between-group difference in decrease not being statistically significant. GCS initially showed significant improvement in the GA/CENT group. BMD decreased significantly in the GA/placebo group (-4.1%) compared with the GA/CENT group (-0.3%). Another 18 months of GA/CENT did not result in a lasting difference in BMD between groups. BI-RAD scores did not differ significantly between or within the two groups. CONCLUSIONS: Adding CENT to GA treatment for DUB in perimenopausal women initially prevented BMD loss and improved climacteric complaints, while having no negative impact on vaginal bleeding, abdominal pain or BI-RAD scores. However, prolonged treatment did not result in a lasting prevention of bone loss.  相似文献   
86.
87.
88.
89.
OBJECTIVES: To identify and describe current women's thoughts about the menopause, hormone treatment (HT) and perceptions about breast cancer. METHODS: Between December 2004 and January 2005, 4201 postmenopausal women in seven European countries were interviewed via a standardized computer-aided telephone interview protocol. RESULTS: Almost all women reported to have experienced climacteric symptoms, and 63% of the women rated them as being severe. Only 52% of women were aware of the benefits of HT for relief of climacteric symptoms. Although 84% felt that severe symptoms should be treated, only 40% had used HT at some point in time. Thirty-four percent of the women preferring treatment with natural products did so because of the risk of breast cancer associated with HT. HT was recognized by 59% of the women as one of the most important contributors to an increased breast cancer risk. Most women received their information about HT and breast cancer risk from the media. CONCLUSIONS: This European survey reveals that the majority of women experience climacteric symptoms but that their decision whether or not to use HT is highly dependent on their concern about breast cancer risk. An increase in knowledge of the benefits and risks of HT is required for women to make appropriate decisions about hormone use.  相似文献   
90.
Bleeding disorders encountered during administration of hormone replacement therapy (HRT) are reviewed. The incidence of bleeding disorders is dependent on the phase of HRT and the age of the patient. In the diagnosis of these bleedings transvaginal sonography and minihysteroscopy are very important methods. Endometrial thickness can be monitored exactly by transvaginal sonography. Outpatient minihysteroscopy without anesthesia results in higher compliance to HRT after the procedure. In hormonal treatment of bleeding disorders during HRT, the sonographically supported progestogen test is very useful and can reduce endometrium thickness. Operative treatments include myoma and polyp resection as well as endometrial ablation. By these methods a high rate of bleeding-free HRT can be reached. The problem of endometrial cancer during HRT is discussed on the basis of new literature and critical statements. The review shows the importance of individual diagnostic and treatment schedules for bleeding disorders during HRT.  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