全文获取类型
收费全文 | 1032篇 |
免费 | 140篇 |
国内免费 | 5篇 |
专业分类
耳鼻咽喉 | 4篇 |
儿科学 | 38篇 |
妇产科学 | 12篇 |
基础医学 | 92篇 |
口腔科学 | 20篇 |
临床医学 | 134篇 |
内科学 | 243篇 |
皮肤病学 | 2篇 |
神经病学 | 54篇 |
特种医学 | 245篇 |
外科学 | 148篇 |
综合类 | 19篇 |
预防医学 | 60篇 |
眼科学 | 7篇 |
药学 | 56篇 |
中国医学 | 3篇 |
肿瘤学 | 40篇 |
出版年
2023年 | 12篇 |
2021年 | 12篇 |
2020年 | 6篇 |
2019年 | 12篇 |
2018年 | 38篇 |
2017年 | 12篇 |
2016年 | 25篇 |
2015年 | 22篇 |
2014年 | 42篇 |
2013年 | 54篇 |
2012年 | 21篇 |
2011年 | 28篇 |
2010年 | 46篇 |
2009年 | 60篇 |
2008年 | 46篇 |
2007年 | 32篇 |
2006年 | 37篇 |
2005年 | 33篇 |
2004年 | 30篇 |
2003年 | 23篇 |
2002年 | 24篇 |
2001年 | 29篇 |
2000年 | 31篇 |
1999年 | 28篇 |
1998年 | 28篇 |
1997年 | 29篇 |
1996年 | 18篇 |
1995年 | 15篇 |
1994年 | 12篇 |
1993年 | 15篇 |
1992年 | 6篇 |
1991年 | 14篇 |
1990年 | 10篇 |
1989年 | 38篇 |
1988年 | 22篇 |
1987年 | 29篇 |
1986年 | 18篇 |
1985年 | 23篇 |
1984年 | 11篇 |
1983年 | 12篇 |
1982年 | 15篇 |
1981年 | 8篇 |
1980年 | 13篇 |
1979年 | 11篇 |
1978年 | 9篇 |
1977年 | 10篇 |
1976年 | 13篇 |
1975年 | 6篇 |
1933年 | 8篇 |
1922年 | 5篇 |
排序方式: 共有1177条查询结果,搜索用时 31 毫秒
1.
2.
Sean J. Barnett M.S. M.D. Christopher Stanley B.S. Melanie Hanlon R.N. C.N.P. Robert Acton M.D. Daniel A. Saltzman M.D. Ph.D. Sayeed Ikramuddin M.D. Henry Buchwald M.D. Ph.D. 《Surgery for obesity and related diseases》2005,1(4):1609-398
PURPOSE: Obesity has become a health-care crisis in the United States. Adolescent obesity is now one of the most common childhood disorders, with 4.7 million American adolescents having a body mass index (BMI) greater than the 95th percentile. Most patients do not respond to diet modification or exercise programs and attention is now turning toward surgery as a source of weight loss in adolescents. Few studies have looked at the overall morbidity and mortality of weight loss surgery in this patient population. METHODS: This is a retrospective study of medical charts of 15 bariatric surgical procedures performed on 14 adolescents without known genetic syndromes associated with severe childhood obesity from 1971 to 2001 at the University of Minnesota. Procedures performed on these patients included vertical banded gastroplasty (n = 7), Roux-en-Y gastric bypass (n = 5), and jejunoileal bypass (n = 3). Jejunoileal bypass procedures were performed from 1971 to 1977, after which time this procedure was abandoned. Patient age ranged from 13 to 17 years (mean, 15.7 years). Mean follow-up time was 6 years, with 9 patients available for long-term follow-up. RESULTS: All procedures were performed using an open technique by 1 surgeon. There were no perioperative deaths; complications included 1 case of wound infection, 2 episodes of dumping syndrome that resolved without revision, 1 episode of hypoglycemia, and 1 case of short-term electrolyte imbalance in a patient who underwent jejunoileal bypass. The average BMI dropped from 58.5 +/- 13.7 to 32.1 +/- 9.7 kg/m(2) (P < .01)--a 45% reduction. CONCLUSIONS: Surgery for morbid obesity is safe and results in significant weight loss in adolescents who fail medical therapy. 相似文献
3.
4.
5.
6.
Y H Neggers G R Cutter J O Alvarez R L Goldenberg R Acton R C Go J M Roseman 《Early human development》1991,25(2):75-85
A retrospective follow-up study to ascertain the relationship between the level of serum zinc and its rate of change during gestation and birthweight was conducted in 476 women of lower socioeconomic status. Serum zinc concentrations measured at approximately 16 (early) and 32 weeks (later) in gestation were both found to be significant predictors of birthweight. Even after controlling for gestational age at birth and other determinants of birthweight, for each microgram/dl increase in serum zinc early and later in pregnancy, birthweight increased by 5.8 and 8.6 g, respectively. Furthermore, after adjustment for initial zinc levels both the total change (beta = -7.0, P = 0.0007) and the rate of change (beta = -60.8, P = 0.007) in serum zinc during pregnancy were inversely associated with birthweight, i.e., the larger the fall in serum zinc during pregnancy, the smaller the infant. Low serum zinc level (less than 60 micrograms/dl) late in pregnancy was associated with greater than a five-fold increase in the odds (OR = 5.8, 95% CI = 1.8, 16.4) of giving birth to a low birthweight infant. The results of this study suggest a threshold for maternal serum zinc below which the prevalence of low birthweight increases rapidly. 相似文献
7.
8.
9.
10.