收费全文 | 1431962篇 |
免费 | 107272篇 |
国内免费 | 6946篇 |
耳鼻咽喉 | 20189篇 |
儿科学 | 45947篇 |
妇产科学 | 40502篇 |
基础医学 | 201449篇 |
口腔科学 | 39280篇 |
临床医学 | 123928篇 |
内科学 | 276172篇 |
皮肤病学 | 29869篇 |
神经病学 | 107180篇 |
特种医学 | 55138篇 |
外国民族医学 | 367篇 |
外科学 | 213587篇 |
综合类 | 48371篇 |
现状与发展 | 14篇 |
一般理论 | 322篇 |
预防医学 | 112378篇 |
眼科学 | 31831篇 |
药学 | 112194篇 |
117篇 | |
中国医学 | 11122篇 |
肿瘤学 | 76223篇 |
2021年 | 12238篇 |
2019年 | 11241篇 |
2018年 | 16447篇 |
2017年 | 13117篇 |
2016年 | 13676篇 |
2015年 | 16980篇 |
2014年 | 22450篇 |
2013年 | 33271篇 |
2012年 | 45831篇 |
2011年 | 48663篇 |
2010年 | 30970篇 |
2009年 | 28463篇 |
2008年 | 45293篇 |
2007年 | 48161篇 |
2006年 | 47895篇 |
2005年 | 46058篇 |
2004年 | 43026篇 |
2003年 | 41220篇 |
2002年 | 40171篇 |
2001年 | 61845篇 |
2000年 | 62959篇 |
1999年 | 52992篇 |
1998年 | 14973篇 |
1997年 | 13437篇 |
1996年 | 13689篇 |
1995年 | 12827篇 |
1994年 | 12131篇 |
1992年 | 41961篇 |
1991年 | 41184篇 |
1990年 | 40699篇 |
1989年 | 39478篇 |
1988年 | 36798篇 |
1987年 | 36025篇 |
1986年 | 34365篇 |
1985年 | 32738篇 |
1984年 | 24374篇 |
1983年 | 21181篇 |
1982年 | 12592篇 |
1979年 | 23078篇 |
1978年 | 16148篇 |
1977年 | 13969篇 |
1976年 | 13229篇 |
1975年 | 14470篇 |
1974年 | 17045篇 |
1973年 | 16421篇 |
1972年 | 15631篇 |
1971年 | 14523篇 |
1970年 | 13550篇 |
1969年 | 13044篇 |
1968年 | 12268篇 |
Objectives
To determine the incidence of incisional hernia (IH) in the extraction incision (EI) in colorectal resection for cancer. To analyze whether the location of the incision has any relationship with the incidence of hernias and whether mesh could be useful for prevention in high-risk patients.Methods
Retrospective review of the colon and rectal surgery database from January 2015 to December 2016. Data were classified into 2 groups, transverse (TI) and midline incision (MI), and the latter was divided into 2 subgroups (mesh [MIM] and suture [MIS]). Patients were classified using the HERNIAscore. Hernias were diagnosed by clinical and/or CT examination.Results
A total of 182 out of 210 surgical patients were included. After a median follow-up of 13.0 months, 39 IH (21.9%) were detected, 23 of which (13.4%) were in the EI; their frequency was lower in the TI group (3.4%) and in the MIM group (5.9%) than in the MIS group (29.5%; p = 0.007). The probability of developing IH in the MIS group showed an OR = 11.7 (95%CI: 3.3-42.0) compared to the TI group and 4.3 (IC 95%: 1.1-16.3) versus the MIM group.Conclusions
The location of the incision is relevant to avoid incisional hernias. Transverse incisions should be used as the first option. When a midline incision is needed, a prophylactic mesh could be considered in high risk patients because it is safe and associated with low morbidity. 相似文献Methods: Data from 1392 girls, aged 9 to 10 at baseline and followed for 10?years, in the National Heart, Lung, and Blood Institute’s National Growth and Health Study were used to examine the association between usual egg intake alone and in combination with other healthy lifestyle factors and late adolescent lipid levels, fasting glucose, and insulin resistance, measured as homeostasis model assessment of insulin resistance (HOMA-IR). Diet was assessed using 3-day food records during eight examination cycles. Girls were classified according to usual weekly egg intake, ages 9–17?years:?<1 egg/wk (n?=?361), 1 to <3 eggs/wk (n?=?703), and ≥3 eggs/wk (n?=?328). Analysis of covariance modeling was used to control for confounding by other behavioral and biological risk factors.
Results: Girls with low, moderate, and high egg intakes had adjusted low-density lipoprotein cholesterol levels of 99.7, 98.8, and 95.5 mg/dL, respectively (p?=?0.0778). In combination with higher intakes of fiber, dairy, or fruits and vegetables, these beneficial effects were stronger and statistically significant. There was no evidence that ≥3 eggs/wk had an adverse effect on lipids, glucose, or HOMA-IR. More active girls who consumed ≥3 eggs/wk had the lowest levels of insulin resistance.
Conclusion: These results suggest that eggs may be included as part of a healthy adolescent diet without adverse effects on glucose, lipid levels, or insulin resistance. 相似文献