全文获取类型
收费全文 | 186325篇 |
免费 | 1752篇 |
国内免费 | 21篇 |
专业分类
耳鼻咽喉 | 1251篇 |
儿科学 | 6897篇 |
妇产科学 | 3269篇 |
基础医学 | 17974篇 |
口腔科学 | 1895篇 |
临床医学 | 13820篇 |
内科学 | 32696篇 |
皮肤病学 | 969篇 |
神经病学 | 17457篇 |
特种医学 | 9178篇 |
外科学 | 29831篇 |
综合类 | 2529篇 |
一般理论 | 9篇 |
预防医学 | 19507篇 |
眼科学 | 3028篇 |
药学 | 10094篇 |
中国医学 | 648篇 |
肿瘤学 | 17046篇 |
出版年
2022年 | 101篇 |
2021年 | 201篇 |
2020年 | 154篇 |
2019年 | 223篇 |
2018年 | 22146篇 |
2017年 | 17510篇 |
2016年 | 19674篇 |
2015年 | 1084篇 |
2014年 | 1095篇 |
2013年 | 1204篇 |
2012年 | 7574篇 |
2011年 | 21692篇 |
2010年 | 19162篇 |
2009年 | 11829篇 |
2008年 | 20016篇 |
2007年 | 22283篇 |
2006年 | 1157篇 |
2005年 | 2754篇 |
2004年 | 3960篇 |
2003年 | 4852篇 |
2002年 | 2969篇 |
2001年 | 494篇 |
2000年 | 628篇 |
1999年 | 372篇 |
1998年 | 324篇 |
1997年 | 309篇 |
1996年 | 169篇 |
1995年 | 178篇 |
1994年 | 189篇 |
1993年 | 153篇 |
1992年 | 197篇 |
1991年 | 246篇 |
1990年 | 268篇 |
1989年 | 200篇 |
1988年 | 183篇 |
1987年 | 173篇 |
1986年 | 157篇 |
1985年 | 139篇 |
1984年 | 119篇 |
1983年 | 112篇 |
1982年 | 117篇 |
1981年 | 83篇 |
1980年 | 123篇 |
1979年 | 91篇 |
1978年 | 104篇 |
1977年 | 95篇 |
1976年 | 83篇 |
1974年 | 103篇 |
1973年 | 66篇 |
1968年 | 66篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
1.
2.
3.
4.
Gastroesophageal reflux is the most common benign disorder of the esophagus and laparoscopic Nissen fundoplication has become the standard surgical treatment for its treatment. In our area, where the use of bougie calibration is debatable, postoperative dysphagia is encountered often after this surgery although it is usually not permanent. The aim of this study was to investigate the effect of using a soft silicone tube 39 F in diameter for esophageal calibration during laparoscopic Nissen fundoplication on the incidence of postoperative dysphagia. We divided cases scheduled to undergo laparoscopic Nissen fundoplication between January 2009 and November 2010 into two groups, each consisting 25 patients. Esophageal calibration with a 39 F silicone orogastric tube was used for the first group while there was no operative calibration in the second group. The surgical duration was recorded; the presence and severity of the postoperative dysphagia was calculated by using a dysphagia severity scoring system during the 1-year postoperative follow-up. The dysphagia severity scores were significantly lower in group 1 than group 2 on the postoperative second day and at the end of the first week and first month. We did not find a significant difference at the end of the 6-month and first year. There was also no significant difference regarding surgery duration. The use of a soft orogastric tube 39 F in diameter for esophagus calibration during laparoscopic Nissen fundoplication has significantly decreased the incidence of postoperative transient dysphagia without affecting the duration of surgery. Although dysphagia gradually resolves in the majority of patients, a safe and easy calibration method for its prevention is worth developing, and we believe that the use of our method in larger series could be beneficial. 相似文献
5.
6.
Objective
The aim of this paper is to study the opportunity costs (OC) that are involved in being a caregiver and to compare them with the direct costs assumed by the State and the families. We evaluate direct cost (those that imply a payment-out-of-pocket) and indirect cost (those that imply a dedication in time). We hypothesized that costs increase with the severity of the dementia, with the educational level and active occupational situation of caregiver. They are greater if the caregiver is male, but if the patient and caregiver cohabit they are reduced.Method
778 surveys were analyzed. Data was collected using a questionnaire specifically designed for the purpose, with the collaboration of Alzheimer's Diseases Associations in Andalusia (Spain). For the indirect cost, we used the reveal preferences method. For the comparison between groups an ANOVA and a MANOVA was done.Results
The hypotheses were confirmed. The OC exponentially increases with severity. More than 55% of costs are assumed by families. Occupied people have higher educational level and incomes and contract more external support. Costs are significantly higher for male caregivers. Cohabiting reduces all kinds of costs.Conclusions
The relationship between educational level and employment situation lead to think that if these variables are greater more people will seek professional support. Cultural reasons still maintain women as main caregivers for all educational levels. The existence of these informal caregivers as the main care providers is a saving for the State, and a brake for the development of professional supply. 相似文献7.
8.
9.
10.