全文获取类型
收费全文 | 586篇 |
免费 | 29篇 |
国内免费 | 6篇 |
专业分类
儿科学 | 30篇 |
妇产科学 | 5篇 |
基础医学 | 56篇 |
口腔科学 | 17篇 |
临床医学 | 30篇 |
内科学 | 149篇 |
皮肤病学 | 6篇 |
神经病学 | 12篇 |
特种医学 | 89篇 |
外科学 | 88篇 |
综合类 | 12篇 |
预防医学 | 30篇 |
眼科学 | 7篇 |
药学 | 41篇 |
肿瘤学 | 49篇 |
出版年
2022年 | 4篇 |
2020年 | 4篇 |
2019年 | 4篇 |
2018年 | 9篇 |
2017年 | 5篇 |
2016年 | 9篇 |
2015年 | 12篇 |
2014年 | 8篇 |
2013年 | 23篇 |
2012年 | 21篇 |
2011年 | 11篇 |
2010年 | 16篇 |
2009年 | 22篇 |
2008年 | 17篇 |
2007年 | 21篇 |
2006年 | 16篇 |
2005年 | 21篇 |
2004年 | 13篇 |
2003年 | 6篇 |
2002年 | 13篇 |
2001年 | 10篇 |
1999年 | 17篇 |
1998年 | 25篇 |
1997年 | 28篇 |
1996年 | 30篇 |
1995年 | 22篇 |
1994年 | 25篇 |
1993年 | 18篇 |
1992年 | 10篇 |
1991年 | 4篇 |
1990年 | 9篇 |
1989年 | 12篇 |
1988年 | 6篇 |
1987年 | 10篇 |
1986年 | 10篇 |
1985年 | 8篇 |
1984年 | 4篇 |
1983年 | 4篇 |
1982年 | 5篇 |
1981年 | 9篇 |
1980年 | 7篇 |
1977年 | 5篇 |
1976年 | 10篇 |
1975年 | 5篇 |
1973年 | 7篇 |
1972年 | 7篇 |
1971年 | 14篇 |
1970年 | 5篇 |
1969年 | 7篇 |
1968年 | 18篇 |
排序方式: 共有621条查询结果,搜索用时 15 毫秒
41.
KM FOCK JY KANG HS NG TM NG KA GWEE CC LIM 《Journal of gastroenterology and hepatology》1995,10(4):379-382
Roxatidine acetate, a new H2 receptor antagonist, was compared with ranitidine in the treatment of duodenal ulcers in a double-blind multicentre study. Eighty-four patients with endoscopically proven duodenal ulcer were randomized to receive 150 mg roxatidine acetate or 300 mg ranitidine at bedtime. Repeat endoscopy was performed after 4 weeks (25–33 days) and if the ulcer had not healed, another endoscopy was performed after a further 4 weeks of treatment. Using per protocol analysis 73.6% of ulcers treated with roxatidine healed at 4 weeks compared to 72.2% of ulcers treated with ranitidine (P=NS). The healing rates at 8 weeks were 92% with roxatidine and 83.3% with ranitidine (P=NS). Using equivalence tests, the healing rate of roxatidine was found to be equivalent to that of ranitidine within a 20% region. Roxatidine users took significantly less antacids than ranitidine users (P < 0.05). There were no significant adverse effects due to roxatidine or ranitidine. Roxatidine is a safe effective drug in the treatment of duodenal ulcers with a healing rate comparable to that of ranitidine. 相似文献
42.
Ultrasonic features of 21 surgically confirmed pyogenic liver abscesses in 18 patients were analyzed. Typical lesions were round or ovoid with a discrete, irregular, echo-poor margin. The number and intensity of internal echoes and sound transmission were variable. Such lesions can be aspirated percutaneously for definitive preoperative diagnosis. Pyogenic liver abscesses appear to have more ragged walls and are less frequently elliptical or multilocular than abscesses elsewhere in the abdomen. 相似文献
43.
44.
45.
46.
47.
Ultrasound diagnosis of hydrocolpos and hydrometrocolpos 总被引:1,自引:0,他引:1
48.
49.
No?l?BB?Knops Kommer?CA?Sneeuw Ronald?Brand Elysee?TM?Hille A?Lya?den Ouden Jan-Maarten?WitEmail author S?Pauline?Verloove-Vanhorick 《BMC pediatrics》2005,5(1):26
Background
Improved survival due to advances in neonatal care has brought issues such as postnatal growth and development more to the focus of our attention. Most studies report stunting in children born very preterm and/or small for gestational age. In this article we study the growth pattern of these children and aim to identify factors associated with postnatal catch-up growth. 相似文献50.
Stair climbing test as a predictor of cardiopulmonary complications after pulmonary lobectomy in the elderly 总被引:3,自引:0,他引:3
BACKGROUND: The objective of this study was to assess the role of a symptom-limited stair climbing test in predicting postoperative cardiopulmonary complications in elderly candidates for lung resection. METHODS: A consecutive series of 109 patients more than 70 years of age who underwent pulmonary lobectomy for lung carcinoma from January 2000 through May 2003 formed the prospective database of this study. All patients in the analysis performed a preoperative symptom-limited stair climbing test. Univariate and multivariate analyses were performed to identify predictors of postoperative cardiopulmonary complications. RESULTS: At univariate analysis, the patients with complications had a lower forced expiratory capacity percentage of predicted (p = 0.048), predicted postoperative forced expiratory volume in 1 second percentage of predicted (p = 0.049), climbed a lower height at preoperative stair climbing test (p = 0.0004), and presented a greater proportion of cardiac comorbiditiy with respect to the patients without complications (p = 0.02). After logistic regression analysis, significant predictors of postoperative complications resulted in the presence of a concomitant cardiac disease (p = 0.04) and a low height climbed preoperatively (p = 0.0015). CONCLUSIONS: A symptom-limited stair climbing test was a safe and simple instrument capable of predicting cardiopulmonary complications in the elderly after lung resection. 相似文献