全文获取类型
收费全文 | 2369篇 |
免费 | 227篇 |
国内免费 | 49篇 |
专业分类
耳鼻咽喉 | 13篇 |
儿科学 | 129篇 |
妇产科学 | 35篇 |
基础医学 | 213篇 |
口腔科学 | 150篇 |
临床医学 | 203篇 |
内科学 | 669篇 |
皮肤病学 | 32篇 |
神经病学 | 78篇 |
特种医学 | 215篇 |
外科学 | 446篇 |
综合类 | 117篇 |
一般理论 | 1篇 |
预防医学 | 132篇 |
眼科学 | 10篇 |
药学 | 93篇 |
中国医学 | 3篇 |
肿瘤学 | 106篇 |
出版年
2021年 | 40篇 |
2020年 | 30篇 |
2019年 | 20篇 |
2018年 | 32篇 |
2017年 | 59篇 |
2016年 | 52篇 |
2015年 | 41篇 |
2014年 | 92篇 |
2013年 | 93篇 |
2012年 | 60篇 |
2011年 | 59篇 |
2010年 | 81篇 |
2009年 | 89篇 |
2008年 | 64篇 |
2007年 | 109篇 |
2006年 | 56篇 |
2005年 | 50篇 |
2004年 | 52篇 |
2003年 | 48篇 |
2002年 | 43篇 |
2001年 | 59篇 |
2000年 | 54篇 |
1999年 | 47篇 |
1998年 | 86篇 |
1997年 | 76篇 |
1996年 | 66篇 |
1995年 | 57篇 |
1994年 | 56篇 |
1993年 | 50篇 |
1992年 | 52篇 |
1991年 | 54篇 |
1990年 | 46篇 |
1989年 | 46篇 |
1988年 | 51篇 |
1987年 | 48篇 |
1986年 | 48篇 |
1985年 | 47篇 |
1984年 | 36篇 |
1983年 | 42篇 |
1982年 | 28篇 |
1980年 | 22篇 |
1979年 | 25篇 |
1978年 | 28篇 |
1977年 | 22篇 |
1976年 | 35篇 |
1975年 | 31篇 |
1971年 | 19篇 |
1969年 | 28篇 |
1968年 | 18篇 |
1966年 | 27篇 |
排序方式: 共有2645条查询结果,搜索用时 46 毫秒
1.
Christopher N. Cooley Tyler J. Beranek Matthew A. Warpinski Robert Alexander Amanda O. Esquivel 《The American journal of emergency medicine》2019,37(2):199-203
Introduction
In the United States there has been a large increase in participation in lacrosse for both males and females. The purpose of this study was to analyze the number of head injuries, injury rates (calculated using the reported number of participants) and types of head injuries that are seen in emergency departments in the United States.Methods
We compared injuries between male and female lacrosse participants. This was a retrospective study using a publicly available database produced by the US Consumer Product Safety Commission and information about lacrosse participation from US Lacrosse.Results
A linear regression was performed and showed a positive correlation between number of head injuries to males and time from 2002 to 2010 (R2?=?0.823; p?=?0.001). While the number of injuries to the head in female lacrosse participants was not significant. There was a negative correlation between the number of head injuries to males from 2010 to 2016 (R2?=?0.800; p?=?0.007), but again, there was no significance for female injury count (R2?=?0.417; p?=?0.117). Other significant differences between head injuries in males and females included the mechanism of injury and the type of injury recorded.Conclusion
The most recent data from 2010 to 2016, suggest that both males and females have had a decrease in injury rate. However the total number of female head injuries is not significantly decreasing and as the sport continues to grow there will likely be more total head injuries and visits to the emergency department. 相似文献2.
By injecting small amounts of CO2 through a needle, one can move bowel or bladder from the intended path of instruments during interventional procedures. The technique worked well in six of seven cases in the pelvis and retroperitoneum; it was not effective in the mediastinum or midabdomen (n = 6). 相似文献
3.
Bilateral ulnar agenesis is a rare abnormality. A total of 36 cases are analyzed: 35 of these are documented in the literature and 1 stillborn male is presented in this study. Most patients had one of the three conditions: Al-Awadi/Raas-Rothschild syndrome, syndrome of ulnar aplasia with split hand/split foot deformity, or the Brachmann—de Lange syndrome. Fifty percent of all cases with bilateral ulnar agenesis were associated with lower limb defects and these cases, for the most part, also belonged to the aforementioned syndromes. Nonskeletal, internal organ malformations were identified in 34% of all patients. Nine patients presented with isolated bilateral ulnar agenesis. The Al-Awadi/Raas-Rothschild syndrome and the split hand/split foot deformity are heritable disorders. There was no evidence for genetic etiology in most of the other cases. Bilateral ulnar agenesis in our fetus was part of the Brachmann—de Lange syndrome with associated cardiac defect, diaphragmatic hernia, and umbilical artery agenesis. 相似文献
4.
外科医生和手术室人员经常接触手术设备产生的烟气,病人也会暴露于烟气中,特别是腹腔镜手术中产生的烟气滞留于腹腔内这一密闭空间并被吸收.这些烟气是一种与香烟烟气相似的毒性物质,然而对这种毒性物质的影响还未引起足够重视.应该采取必要措施尽可能减少手术中烟气的不良影响. 相似文献
5.
Contact of teen mothers with grandmothers and partners was studied as a predictor of maternal and middle childhood developmental outcomes. Mothers were interviewed yearly beginning in 1979 until 1986. Each child was given a developmental assessment in 1986. Black teens lived longer with their parents after the child's birth and white teens married earlier and had more disruptions in their relationships. Grandmother assistance with childcare was positively associated with the mother's ability to pursue her education. The findings suggested, however, that child developmental problems may occur when mothers routinely rely upon grandmother assistance into middle childhood, particularly for white families. In general, a male partner who had regular contact with the mother's child, more stimulation and support in the home environment, and higher educational level of the mother were associated with better child developmental outcomes. 相似文献
6.
7.
8.
9.
10.