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   1335421篇
  免费   96014篇
  国内免费   2914篇
耳鼻咽喉   19713篇
儿科学   40259篇
妇产科学   38668篇
基础医学   187317篇
口腔科学   39820篇
临床医学   112686篇
内科学   262705篇
皮肤病学   30219篇
神经病学   106567篇
特种医学   53768篇
外国民族医学   435篇
外科学   208373篇
综合类   31057篇
现状与发展   6篇
一般理论   436篇
预防医学   92073篇
眼科学   31418篇
药学   100123篇
  4篇
中国医学   2991篇
肿瘤学   75711篇
  2018年   11756篇
  2015年   11889篇
  2014年   16707篇
  2013年   25282篇
  2012年   33073篇
  2011年   34940篇
  2010年   20773篇
  2009年   20274篇
  2008年   33646篇
  2007年   36754篇
  2006年   37316篇
  2005年   36072篇
  2004年   35129篇
  2003年   34141篇
  2002年   33660篇
  2001年   63646篇
  2000年   65354篇
  1999年   55431篇
  1998年   14668篇
  1997年   13474篇
  1996年   12948篇
  1995年   12231篇
  1994年   11479篇
  1992年   42783篇
  1991年   41301篇
  1990年   40575篇
  1989年   39568篇
  1988年   36975篇
  1987年   36412篇
  1986年   34910篇
  1985年   33115篇
  1984年   24835篇
  1983年   21060篇
  1982年   12667篇
  1981年   11572篇
  1980年   10778篇
  1979年   23927篇
  1978年   17073篇
  1977年   14837篇
  1976年   13387篇
  1975年   15270篇
  1974年   18084篇
  1973年   17562篇
  1972年   16811篇
  1971年   15720篇
  1970年   14917篇
  1969年   14347篇
  1968年   13465篇
  1967年   12017篇
  1966年   11260篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
101.
Choledochal cysts (CDCs) and biliary atresia (BA) are rare pediatric hepatobiliary anomalies that require surgical intervention due to increased risk of malignancy and liver failure, respectively. The underlying disease and operative procedures place patients at risk for long‐term complications, which may continue to affect them into adulthood. Lack of a transitional care model in the health‐care system potentiates the challenges they will face following aging out of their pediatric providers' care. We sought to elucidate the long‐term complications and challenges patients with CDCs and BA face, review the current literature regarding transitioning care, and propose guidelines aiding adult providers in continued care and surveillance of these patients. A literature review was performed to assess short‐term and long‐term complications after surgery and the current standards for transitioning care in patients with a history of CDCs and BA. While transitional programs exist for patients with other gastrointestinal diseases, there are few that focus on CDCs or BA. Generally, authors encourage medical record transmission from pediatric to adult providers, ensuring accuracy of information and compliance with treatment plans. Patients with CDCs are at risk for developing biliary malignancies, cholangitis, and anastomotic strictures after resection. Patients with BA develop progressive liver failure, necessitating transplantation. There are no consensus guidelines regarding timing of follow up for these patients. Based on the best available evidence, we propose a schema for long‐term surveillance.  相似文献   
102.
103.
104.
105.
106.
107.
108.
Objective: To assess the quality of images and video clips of fetal central nervous (CNS) structures obtained by ultrasound and transmitted via tele-ultrasound from Brazil to Australia.

Methods: In this cross-sectional study, 15 normal singleton pregnant women between 20 and 26 weeks were selected. Fetal CNS structures were obtained by images and video clips. The exams were transmitted in real-time using a broadband internet and an inexpensive video streaming device. Four blinded examiners evaluated the quality of the exams using the Likert scale. We calculated the mean, standard deviation, mean difference, and p values were obtained from paired t tests.

Results: The quality of the original video clips was slightly better than that observed by the transmitted video clips; mean difference considering all observers = 0.23 points. In 47/60 comparisons (78.3%; 95% CI?=?66.4–86.9%) the quality of the video clips were judged to be the same. In 182/240 still images (75.8%; 95% CI?=?70.0–80.8%) the scores of transmitted image were considered the same as the original.

Conclusion: We demonstrated that long distance tele-ultrasound transmission of fetal CNS structures using an inexpensive video streaming device provided images of subjective good quality.  相似文献   
109.
110.
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