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   3956篇
  免费   337篇
  国内免费   22篇
耳鼻咽喉   20篇
儿科学   132篇
妇产科学   61篇
基础医学   614篇
口腔科学   115篇
临床医学   500篇
内科学   802篇
皮肤病学   50篇
神经病学   363篇
特种医学   219篇
外科学   539篇
综合类   83篇
一般理论   4篇
预防医学   408篇
眼科学   14篇
药学   232篇
中国医学   2篇
肿瘤学   157篇
  2021年   38篇
  2020年   47篇
  2019年   54篇
  2018年   66篇
  2017年   43篇
  2016年   56篇
  2015年   54篇
  2014年   82篇
  2013年   157篇
  2012年   198篇
  2011年   210篇
  2010年   93篇
  2009年   91篇
  2008年   185篇
  2007年   202篇
  2006年   170篇
  2005年   171篇
  2004年   154篇
  2003年   147篇
  2002年   114篇
  2001年   111篇
  2000年   128篇
  1999年   116篇
  1998年   54篇
  1997年   56篇
  1996年   57篇
  1995年   40篇
  1994年   51篇
  1993年   49篇
  1992年   95篇
  1991年   82篇
  1990年   93篇
  1989年   94篇
  1988年   70篇
  1987年   86篇
  1986年   80篇
  1985年   85篇
  1984年   49篇
  1983年   63篇
  1982年   30篇
  1981年   32篇
  1980年   27篇
  1979年   44篇
  1978年   28篇
  1977年   36篇
  1976年   27篇
  1975年   32篇
  1974年   27篇
  1972年   32篇
  1971年   28篇
排序方式: 共有4315条查询结果,搜索用时 15 毫秒
81.
82.
83.
Medically underserved populations continue to be disproportionately burdened by cancer. The exact reason for this disparity has not been fully elucidated, but likely involves multiple factors. We explored the potential utility of a novel community-based cancer education program called Forum Theater (FT), aimed at raising awareness about colorectal (CRC) and cervical cancer (CxC) screening among African–American, Hispanic, and Vietnamese populations. We also determined audience likelihood of obtaining CRC and CxC screening in the 6 months following performances. Thirty FT performances were held between September 2011 and July 2012. A brief survey was administered at each performance, eliciting responses on key CRC and CxC screening questions. A total of 662 community residents (316 Hispanic, 165 African–American, and 181 Vietnamese; overall mean age 50.3?±?16.4) participated in performances. The survey response rate was 71.1 %. After seeing FT performances, the majority responded correctly (>70 %) on CRC and CxC screening questions. In comparison to Hispanic and Vietnamese participants, African–Americans were less likely to report that CRC and CxC are preventable (p?<?0.05), that timely and regular screening saves lives (p?=?0.05), and that CxC screening should begin at age 21 for most women (p?<?0.05). Our findings suggest that FT may be an effective strategy to disseminate cancer screening information. Lack of awareness that CRC/CxC screening saves lives and that CRC/CxC is preventable, as reported by African–Americans, may not stem from lack of knowledge or misconceptions alone, but may be influenced by a sense of fatalism regarding cancer outcomes in this population.  相似文献   
84.
Acinar cell carcinoma (ACC) is a rare pancreatic malignancy with distinctive clinical, molecular, and morphological features. The long-term survival of ACC patients is substantially superior to that of pancreatic adenocarcinoma patients. As there are no significant patient series about ACCs, our understanding of this illness is mainly based on case reports and limited patient series. Surgical resection is the treatment of choice for patients with the disease restricted to one organ; however, with recent breakthroughs in precision medicine, medicines targeting the one-of-a-kind molecular profile of ACC are on the horizon. There are no standard treatment protocols available for people in which a total surgical resection to cure the condition is not possible. As a result of shared genetic alterations, ACCs are chemosensitive to agents with activity against pancreatic adenocarcinomas and colorectal carcinomas. The role of neoadjuvant or adjuvant chemoradiotherapy has not been established. This article aims to do a comprehensive literature study and present the most recent information on acinar cell cancer.  相似文献   
85.
86.
87.
88.
89.
BACKGROUND: Intraoperative blood salvage (IBS) is a technique that is frequently used in major blood loss surgery. Classically, it is avoided during cancer surgery where a fear exists of entraining cancer cells into the shed blood. In this study, all reports of this practice were collected to determine if this fear is warranted. STUDY DESIGN AND METHODS: A literature search was performed including the search phrases “blood salvage,”“intraoperative blood salvage,”“cell salvage,”“cell saver,”“cell saving,”“autotransfusion,” and “autologous transfusion.” Data extracted from suitable papers included the authors' names, publication year, cancer type, exclusion criteria, sample size, length of follow‐up, and the mean patient age. The primary endpoint of this meta‐analysis was a comparison of the odds ratio (OR) for cancer recurrence or the development of metastases. RESULTS: Eleven studies were included in the analysis. The pooled summary of the OR was 0.65 (95% confidence interval, 0.43‐0.98; p = 0.0391) using a random‐effects model. Measures of heterogeneity, Q‐statistics (p = 0.1615) and I2 (30.90%), did not indicate a high degree of between‐study variability. CONCLUSIONS: While significant variability existed between studies, this meta‐analysis suggests that outcomes after the use of IBS are not inferior to traditional intraoperative allogeneic transfusion. An adequately powered prospective, randomized trial of IBS use is required to determine its true risk during cancer surgery.  相似文献   
90.
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