收费全文 | 3223785篇 |
免费 | 231968篇 |
国内免费 | 5050篇 |
耳鼻咽喉 | 45483篇 |
儿科学 | 105751篇 |
妇产科学 | 89463篇 |
基础医学 | 472835篇 |
口腔科学 | 90155篇 |
临床医学 | 287683篇 |
内科学 | 618932篇 |
皮肤病学 | 70114篇 |
神经病学 | 256108篇 |
特种医学 | 122331篇 |
外国民族医学 | 835篇 |
外科学 | 486395篇 |
综合类 | 67175篇 |
现状与发展 | 12篇 |
一般理论 | 1153篇 |
预防医学 | 252673篇 |
眼科学 | 75523篇 |
药学 | 240977篇 |
12篇 | |
中国医学 | 6319篇 |
肿瘤学 | 170874篇 |
2018年 | 35424篇 |
2017年 | 26718篇 |
2016年 | 30040篇 |
2015年 | 34067篇 |
2014年 | 47792篇 |
2013年 | 71772篇 |
2012年 | 99219篇 |
2011年 | 105629篇 |
2010年 | 62667篇 |
2009年 | 59146篇 |
2008年 | 99673篇 |
2007年 | 106323篇 |
2006年 | 107409篇 |
2005年 | 104298篇 |
2004年 | 99715篇 |
2003年 | 96064篇 |
2002年 | 93381篇 |
2001年 | 142248篇 |
2000年 | 145869篇 |
1999年 | 123188篇 |
1998年 | 36632篇 |
1997年 | 32196篇 |
1996年 | 32532篇 |
1995年 | 30559篇 |
1994年 | 28358篇 |
1993年 | 26663篇 |
1992年 | 96985篇 |
1991年 | 94845篇 |
1990年 | 92955篇 |
1989年 | 89928篇 |
1988年 | 83124篇 |
1987年 | 81526篇 |
1986年 | 77113篇 |
1985年 | 73896篇 |
1984年 | 55191篇 |
1983年 | 47266篇 |
1982年 | 28402篇 |
1981年 | 25428篇 |
1979年 | 51579篇 |
1978年 | 36638篇 |
1977年 | 30975篇 |
1976年 | 29465篇 |
1975年 | 32117篇 |
1974年 | 38164篇 |
1973年 | 36569篇 |
1972年 | 34585篇 |
1971年 | 32594篇 |
1970年 | 30171篇 |
1969年 | 28803篇 |
1968年 | 26831篇 |
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Robotic approaches have been steadily replacing laparoscopic approaches in metabolic and bariatric surgeries (MBS); however, their superiority has not been rigorously evaluated. The main goal of the study was to evaluate the 5-year utilization trends of robotic MBS and to compare to laparoscopic outcomes.
MethodsRetrospective analysis of 2015–2019 MBSAQIP data. Kruskal-Wallis test/Wilcoxon and Fisher’s exact/chi-square were used to compare continuous and categorical variables, respectively. Generalized linear models were used to compare surgery outcomes.
ResultsThe use of robotic MBS increased from 6.2% in 2015 to 13.5% in 2019 (N= 775,258). Robotic MBS patients had significantly higher age, BMI, and likelihood of 12 diseases compared to laparoscopic patients. After adjustment, robotic MBS patients showed higher 30-day interventions and 30-day readmissions alongside longer surgery time (26–38 min).
ConclusionRobotic MBS shows higher intervention and readmission even after controlling for cofounding variables.
Graphical Abstract 相似文献