全文获取类型
收费全文 | 4473篇 |
免费 | 399篇 |
国内免费 | 11篇 |
专业分类
耳鼻咽喉 | 17篇 |
儿科学 | 140篇 |
妇产科学 | 156篇 |
基础医学 | 611篇 |
口腔科学 | 53篇 |
临床医学 | 598篇 |
内科学 | 782篇 |
皮肤病学 | 77篇 |
神经病学 | 480篇 |
特种医学 | 108篇 |
外科学 | 378篇 |
综合类 | 57篇 |
一般理论 | 4篇 |
预防医学 | 641篇 |
眼科学 | 157篇 |
药学 | 286篇 |
中国医学 | 6篇 |
肿瘤学 | 332篇 |
出版年
2023年 | 61篇 |
2022年 | 92篇 |
2021年 | 166篇 |
2020年 | 107篇 |
2019年 | 180篇 |
2018年 | 168篇 |
2017年 | 112篇 |
2016年 | 124篇 |
2015年 | 148篇 |
2014年 | 168篇 |
2013年 | 241篇 |
2012年 | 357篇 |
2011年 | 327篇 |
2010年 | 182篇 |
2009年 | 164篇 |
2008年 | 236篇 |
2007年 | 240篇 |
2006年 | 250篇 |
2005年 | 239篇 |
2004年 | 246篇 |
2003年 | 227篇 |
2002年 | 220篇 |
2001年 | 36篇 |
2000年 | 29篇 |
1999年 | 28篇 |
1998年 | 44篇 |
1997年 | 36篇 |
1996年 | 34篇 |
1995年 | 30篇 |
1994年 | 31篇 |
1993年 | 27篇 |
1992年 | 25篇 |
1991年 | 19篇 |
1990年 | 16篇 |
1989年 | 18篇 |
1988年 | 14篇 |
1987年 | 9篇 |
1986年 | 17篇 |
1985年 | 8篇 |
1984年 | 24篇 |
1983年 | 19篇 |
1982年 | 16篇 |
1981年 | 17篇 |
1980年 | 18篇 |
1978年 | 12篇 |
1977年 | 8篇 |
1976年 | 10篇 |
1975年 | 6篇 |
1972年 | 7篇 |
1970年 | 6篇 |
排序方式: 共有4883条查询结果,搜索用时 15 毫秒
71.
Pauline Chauvin Jean-Michel Josselin Denis Heresbach 《The European journal of health economics》2014,15(8):801-812
When a cost-effectiveness analysis is implemented, the health-care system is usually assumed to adjust smoothly to the proposed new strategy. However, technological innovations in health care may often induce friction in the organization of care supply, implying the congestion of services and subsequent waiting times. Our objective here is to measure how these short run rigidities can challenge cost-effectiveness recommendations favorable to an innovative mass screening test for colorectal cancer. Using Markov modeling, we compare the standard Guaiac fecal occult blood test (gFOBT) with an innovative screening test for colorectal cancer, namely the immunological fecal occult blood test (iFOBT). Waiting time can occur between a positive screening test and the subsequent confirmation colonoscopy. Five scenarios are considered for iFOBT: no further waiting time compared with gFOBT, twice as much waiting time for a period of 5 or 10 years, and twice as much waiting time for a period of 5 or 10 years combined with a 25 % decrease in participation to confirmation colonoscopies. According to our modeling, compared with gFOBT, iFOBT would approximately double colonoscopy demand. Probabilistic sensitivity analysis enables concluding that the waiting time significantly increases the uncertainty surrounding recommendations favorable to iFOBT if it induces a decrease in the adherence rate for confirmation colonoscopy. 相似文献
72.
73.
74.
75.
76.
77.
78.
Nelly J. Yatich Pauline E. Jolly Ellen Funkhouser Tsiri Agbenyega Julian C. Rayner John E. Ehiri Archer Turpin Jonathan K. Stiles William O. Ellis Yi Jiang Jonathan H. Williams 《The American journal of tropical medicine and hygiene》2010,82(1):28-34
This study was conducted to investigate the effect of Plasmodium falciparum and intestinal helminth coinfection on maternal anemia and birth outcomes. A cross-sectional study of 746 women who delivered in two hospitals in Kumasi was conducted. Data were collected using an investigator-administered questionnaire and from patients'' medical records. Blood was collected for determination of P. falciparum and hemoglobin levels. Adverse pregnancy outcomes were high (44.6%). Coinfection (versus no infection) was associated with 3-fold increase in low birth weight. For women with anemia, coinfection was 2.6 times and 3.5 times as likely to result in preterm deliveries and small for gestational age infants. The odds of having anemia was increased almost 3-fold by coinfection. Coinfection (versus helminth only) resulted in increased risks of anemia, low birth weight, and small for gestational age infants. This study demonstrates that women with malaria and intestinal helminth coinfection are at particular risk of adverse birth outcomes. 相似文献
79.
Dessureault S Coppola D Weitzner M Powers P Karl RC 《Journal of gastrointestinal cancer》2002,32(1):57-61
We report the association of Barrett's esophagus and invasive squamous cell carcinoma of the distal esophagus in a young 31-yr-old woman with a history of self-induced psychogenic vomiting. The development of intestinalized columnar mucosa and esophageal cancer in this young patient illustrates the complicated associations between human behavior and pathogenetic mechanisms involved in esophageal carcinogenesis. 相似文献
80.
PURPOSE: Colonoscopy has been the principal tool for decompression in acute colonic pseudo-obstruction, known as Ogilvie's syndrome. The objectives of this study were to determine the immediate effect of colonoscopy on the cecal diameter (measured on supine radiographs) and to delineate possible correlations in the diameters of dilated segments of the colon. METHODS: The charts and radiographs of 24 patients who had colonoscopic decompression for acute colonic pseudo-obstruction between 1992 and 1997 at the San Diego Veterans Affairs Medical Center and the University of California, San Diego Hospitals were reviewed. We measured cecal, transverse, descending, and sigmoid colon diameters on serial radiographs up to the point of clinical resolution. RESULTS: Mean ± standard deviation cecal diameter change (between initial and post-decompression films) was –2±3.4 cm at four hours and –2.2±3.3 cm one day after decompression. On the daily radiographs between colonoscopic decompression and clinical resolution, there was a close correlation between the diameter of the cecum and that of the transverse colon (P<0.05). There was no correlation between the cecal diameter and that of the descending or sigmoid colon. CONCLUSIONS: Colonoscopic decompression only causes a small decrease in cecal size in the patient with acute colonic pseudo-obstruction. Dilation patterns of the cecum and transverse colon are significantly correlated in acute colonic pseudo-obstruction. This correlation provides additional support to the contention that the same pathophysiology affects these two segments of the colon.Presented at the joint meeting of the Northwest Society of Colon and Rectal Surgeons, Northern California Society of Colon and Rectal Surgeons, and Southern California Society of Colon and Rectal Surgeons, Incline Village, Nevada, August 18 to 21, 1999. 相似文献