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   19162篇
  免费   1410篇
  国内免费   32篇
耳鼻咽喉   177篇
儿科学   703篇
妇产科学   605篇
基础医学   2546篇
口腔科学   211篇
临床医学   2501篇
内科学   3312篇
皮肤病学   299篇
神经病学   2259篇
特种医学   364篇
外科学   1765篇
综合类   182篇
现状与发展   1篇
一般理论   20篇
预防医学   2807篇
眼科学   185篇
药学   1213篇
  1篇
中国医学   16篇
肿瘤学   1437篇
  2024年   35篇
  2023年   231篇
  2022年   368篇
  2021年   794篇
  2020年   493篇
  2019年   687篇
  2018年   763篇
  2017年   579篇
  2016年   651篇
  2015年   655篇
  2014年   797篇
  2013年   1217篇
  2012年   1730篇
  2011年   1725篇
  2010年   855篇
  2009年   749篇
  2008年   1162篇
  2007年   1247篇
  2006年   1100篇
  2005年   1004篇
  2004年   941篇
  2003年   781篇
  2002年   756篇
  2001年   96篇
  2000年   74篇
  1999年   96篇
  1998年   131篇
  1997年   108篇
  1996年   74篇
  1995年   74篇
  1994年   53篇
  1993年   49篇
  1992年   44篇
  1991年   29篇
  1990年   22篇
  1989年   29篇
  1988年   27篇
  1987年   28篇
  1986年   31篇
  1985年   17篇
  1984年   43篇
  1983年   17篇
  1982年   36篇
  1981年   35篇
  1980年   22篇
  1979年   13篇
  1978年   13篇
  1977年   7篇
  1976年   12篇
  1975年   19篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
11.
Surgery alone has long been the standard treatment for patients with operable non-small-cell lung cancer (NSCLC). However, despite complete resection, 5-year survival rates have been disappointing, with about 50% of patients eventually suffering relapse and death from disease. Randomized trials conducted in the 1980s hinted at a survival benefit for postoperative cisplatin-based regimens, but they were underpowered. A meta-analysis published in 1995 found a nonsignificant 13% reduction in the risk of death associated with cisplatin-based chemotherapy, with an increase of survival of 5% at 5 years. This led to renewed interest in adjuvant chemotherapy in resected NSCLC. Thousands of patients have been included in a new generation of randomized trials in the last 10 years. Most of these recent studies have now been reported and several have demonstrated a clear survival advantage for patients treated with platin-based adjuvant therapy. These results also suggest a greater benefit with modern two-drug regimens. In view of the most recent data, postoperative platin-based chemotherapy can now be considered the standard of care for completely resected NSCLC patients with good performance status.  相似文献   
12.
13.
ObjectivesTo evaluate and summarize the evidence linking balance impairment as a risk factor for falls in community-dwelling older adults.Study Design and SettingSystematic review and meta-analysis. English language articles in MEDLINE, EMBASE, CINAHL (1988–2009), under keywords of accidental falls, aged, risk factors, and hip, radius, ulna, and humerus fractures; and bibliographies of retrieved articles. Community-dwelling older adults in a prospective study, at least 1-year duration, age more than 60 years, and samples not specific to a single disease-defined population were included. Sample size, inclusion/exclusion criteria, demographics, clinical balance measurement scale, type of fall outcome, method of fall ascertainment, length of follow-up, and odds ratio (OR) or risk ratio (RR) were extracted. Studies must have reported adjustment for confounders. Random effects meta-analysis to generate summary risk estimate was used. A priori evaluation of sources of heterogeneity was performed.ResultsTwenty-three studies met the selection criteria. A single summary measure could not be calculated because of the nonequivalence of the OR and RR, producing an overall fall risk of RR of 1.42 (1.08, 1.85) and OR of 1.98 (1.60, 2.46).ConclusionsBalance impairment imparts a moderate increase on fall risk in community-dwelling older adults. The type of fall outcome, the length of follow-up, and the balance measurement tool impact the magnitude of the association. Specific balance measurement scales were identified with associations for an increased fall risk, but further research is required to refine recommendations for their use in clinical practice.  相似文献   
14.
15.
16.
17.
18.
19.
20.
Objective: Generate a list of service guidelines to enable supermarket managers to accommodate the needs of their older customers. Methods: Focus groups and a national telephone survey were conducted with Australian seniors to generate 10 service guidelines for supermarkets. Results: The 10 guidelines produced are considered to be of significant importance by Australian seniors, with some apparent differences in importance and relevance ratings between older and younger seniors, and males and females. Conclusions: Seniors have distinct service preferences when grocery shopping and their needs require special attention in the supermarket environment. In particular, they feel strongly about the quality of staff and equipment with which they come into contact.  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