全文获取类型
收费全文 | 31468篇 |
免费 | 2624篇 |
国内免费 | 722篇 |
专业分类
耳鼻咽喉 | 238篇 |
儿科学 | 1277篇 |
妇产科学 | 778篇 |
基础医学 | 1833篇 |
口腔科学 | 909篇 |
临床医学 | 3586篇 |
内科学 | 6360篇 |
皮肤病学 | 411篇 |
神经病学 | 1367篇 |
特种医学 | 800篇 |
外国民族医学 | 1篇 |
外科学 | 2902篇 |
综合类 | 4281篇 |
现状与发展 | 1篇 |
预防医学 | 4578篇 |
眼科学 | 334篇 |
药学 | 2472篇 |
36篇 | |
中国医学 | 1402篇 |
肿瘤学 | 1248篇 |
出版年
2024年 | 69篇 |
2023年 | 855篇 |
2022年 | 1342篇 |
2021年 | 2189篇 |
2020年 | 1884篇 |
2019年 | 1744篇 |
2018年 | 1725篇 |
2017年 | 1306篇 |
2016年 | 1193篇 |
2015年 | 1149篇 |
2014年 | 2365篇 |
2013年 | 2248篇 |
2012年 | 1896篇 |
2011年 | 2026篇 |
2010年 | 1615篇 |
2009年 | 1544篇 |
2008年 | 1432篇 |
2007年 | 1464篇 |
2006年 | 1056篇 |
2005年 | 963篇 |
2004年 | 744篇 |
2003年 | 621篇 |
2002年 | 426篇 |
2001年 | 400篇 |
2000年 | 289篇 |
1999年 | 272篇 |
1998年 | 216篇 |
1997年 | 203篇 |
1996年 | 163篇 |
1995年 | 173篇 |
1994年 | 162篇 |
1993年 | 125篇 |
1992年 | 138篇 |
1991年 | 116篇 |
1990年 | 92篇 |
1989年 | 81篇 |
1988年 | 57篇 |
1987年 | 67篇 |
1986年 | 48篇 |
1985年 | 60篇 |
1984年 | 58篇 |
1983年 | 42篇 |
1982年 | 39篇 |
1981年 | 36篇 |
1980年 | 29篇 |
1979年 | 19篇 |
1978年 | 22篇 |
1977年 | 14篇 |
1976年 | 16篇 |
1975年 | 6篇 |
排序方式: 共有10000条查询结果,搜索用时 86 毫秒
21.
To evaluate the anthropometric indexes in subjects with varicocele compared to controls and the incidence of varicocele in different body mass index (BMI) groups for the purpose of exploring the association between varicocele and anthropometric indexes. A comprehensive literature search was conducted by using PubMed, MEDLINE, EMBASE databases and Cochrane Library up to February 2019. A systematic review and meta‐analysis was conducted by STATA, and Newcastle–Ottawa Scale was utilised for assessing risk of bias. Ultimately, 13 articles containing seven case–control studies and six cross‐sectional studies with 1,385,630 subjects were involved in our study. Pooled results demonstrated that varicocele patients had a lower BMI (WMD = ?0.77, 95% CI = ?1.03 to ?0.51) and a higher height than nonvaricocele participants, especially in grade 3 varicocele patients. Subgroup analyses showed that normal BMI individuals had a higher risk of varicocele than obese or overweight individuals and a lower risk than underweight individuals. In conclusion, this study indicates that varicocele patients have a lower BMI and a higher height than nonvaricocele participants. Moreover, men with excess bodyweight have a lower incidence of varicocele compared to normal weight or underweight people. That is to say, high BMI and adiposity protect against varicocele and high BMI is associated with a decreased risk of varicocele. 相似文献
22.
《The ocular surface》2020,18(4):657-662
PurposeTo determine if meibomian gland architecture in a pediatric population is impacted by body mass index (BMI).MethodsProspective evaluation of 175 eyes of 175 pediatric patients from two clinics. Demographic and clinical information were reviewed. Symptoms of dry eye were assessed with the Standard Patient Evaluation of Eye Dryness (SPEED) questionnaire. Meibography was performed and grading of images was performed by a masked rater using a previously validated 5-point meiboscale (0–4) for gland atrophy and a 3-point score (0–2) for gland tortuosity.Results175 eyes of 175 participants aged 4–17 years (11.6 ± 3.7 years) were imaged. The mean meiboscore was 0.82 ± 0.94 (range 0–4) and the mean gland tortuosity score was 0.53 ± 0.70 (range 0–2). Ninety-six patients (56%) showed evidence of gland atrophy (meiboscore greater than 0) and the majority of patients (n=50, 29%) had a gland tortuosity score of 1. The mean BMI was 20.5 ± 4.86 kg/m2 with 39.4% of patients (n = 69) above the 85th percentile. BMI percentile was not found to be a significant predictor of a meiboscore greater than 0 (odds ratio (OR) 1.004 95% confidence interval (CI) (0.99–1.10, p = 0.41). However, BMI percentile was found to be a significant predictor of gland tortuosity score (OR 1.01 95% CI (1.00–1.02), p = 0.02). Patients with BMI percentiles between 41 and 60 were 3.79 times more likely to have a gland tortuosity score of greater than 0 than patients with BMI percentiles between 0 and 20 (OR 3.789 CI (1.17–12.24)). No significant associations were found between age, race, or sex and meiboscore or tortuosity. There was a trend towards reduction in lipid layer thickness with increasing BMI percentile (p = 0.028, r2 = 0.04).ConclusionIn this pediatric population, there was an association between meibomian gland tortuosity and higher percentiles of BMI. Future studies are needed to elucidate the pathogenesis of meibomian gland tortuosity and atrophy in pediatric patients. 相似文献
23.
24.
膳食炎症指数(DII)来源于将饮食和炎症联系起来的文献,被开发用来量化饮食的整体炎症潜能。饮食在调节慢性炎症中起着核心作用,是重要的调节因子,如果饮食的炎症潜能很高,则能够激发免疫调节作用,引起慢性炎症。DII可用于评估和指导个人饮食计划。本研究收集国外相关文献,就DII与炎症之间的相关性予以综述,以期通过减少饮食中的炎性成分而对慢性炎症引起的相关疾病进行一级预防。 相似文献
25.
《Mayo Clinic proceedings. Mayo Clinic》2022,97(12):2271-2281
ObjectiveTo investigate the association between type 1 diabetes mellitus (T1D) and type 2 diabetes mellitus (T2D) with risk of sudden cardiac arrest (SCA).MethodsIn a prospective community-based study of SCA from February 1, 2002, through November 30, 2019, we ascertained 2771 cases age 18 years of age or older and matched them to 8313 controls based on geography, age, sex, and race/ethnicity. We used logistic regression to evaluate the independent association between diabetes, T1D, T2D, and SCA.ResultsPatients had a mean age of 64.5±15.9 years, were 33.3% female and 23.9% non-White race. Overall, 36.7% (n=1016) of cases and 23.8% (n=1981) of controls had diabetes. Among individuals with diabetes, the proportion of T1D was 6.5% (n=66) among cases and 2.0% among controls (n=40). Diabetes was associated with 1.5-times higher odds of SCA. Compared with those without diabetes, the odds ratio and 95% CI for SCA was 4.36 (95% CI, 2.81 to 6.75; P<.001) in T1D and 1.45 (95% CI, 1.30 to 1.63; P<.001) in T2D after multivariable adjustment. Among those with diabetes, the odds of having SCA were 2.41 times higher in T1D than in T2D (95% CI, 1.53 to 3.80; P<.001). Cases of SCA with T1D were more likely to have an unwitnessed arrest, less likely to receive resuscitation, and less likely to survive compared with those with T2D.ConclusionType 1 diabetes was more strongly associated with SCA compared with T2D and had less favorable outcomes following resuscitation. Diabetes type could influence the approach to risk stratification and prevention of SCA. 相似文献
26.
Kensuke Kudou Hiroshi Saeki Yuichiro Nakashima Shun Sasaki Tomoko Jogo Kosuke Hirose Qingjiang Hu Yasuo Tsuda Koichi Kimura Ryota Nakanishi Nobuhide Kubo Koji Ando Eiji Oki Tetsuo Ikeda Yoshihiko Maehara 《American journal of surgery》2019,217(4):757-763
Background
There were few studies assessed the postoperative sarcopenia in patients with cancers. The objective of present study was to assess whether postoperative development of sarcopenia could predict a poor prognosis in patients with adenocarcinoma of esophagogastric junction, (AEG) and upper gastric cancer (UGC).Methods
Patients with AEG and UGC who were judged as non-sarcopenic before surgery were reassessed the presence of postoperative development of sarcopenia 6 months after surgery. Patients were divided into the development group or non-development group, and clinicopathological factors and prognosis between these two groups were analyzed.Results
The 5-year overall survival rates were significantly poorer in the development group than non-development group (68.0% vs. 92.6%, P?=?0.0118). Multivariate analyses showed that postoperative development of sarcopenia was an independent prognostic factor for poor overall survival (P?=?0.0237).Conclusions
Postoperative development of sarcopenia was associated with a poor prognosis in patients with AEG and UGC. 相似文献27.
28.
Could non-HDL-cholesterol be a better marker of atherogenic dyslipidemia in obstructive sleep apnea?
《Sleep medicine》2021
Background/objectiveObstructive sleep apnea (OSA) is independently associated with dyslipidemia, a surrogate marker of atherosclerosis. Low-density lipoprotein (LDL)-cholesterol is accepted as a major independent risk factor for cardiovascular disease. However, non-high-density lipoprotein (HDL)-cholesterol is a better marker of atherogenic dyslipidemia and recommended as a target of lipid lowering therapy. We aimed to assess the prevalence of atherogenic dyslipidemia, and relationship between OSA severity and serum LDL-cholesterol and non-HDL cholesterol levels in OSA patients.MethodsWe retrospectively evaluated treatment naïve 2361 subjects admitted to the sleep laboratory of a university hospital for polysomnography. All subjects’ lipid profile including total cholesterol, LDL-cholesterol, HDL-cholesterol, triglycerides, and non-HDL-cholesterol were measured.ResultsOut of 2361 patients (mean age 49.6 ± 11.9 years; 68.9% male, apnea-hypopnea index 36.6 ± 28.4/h), 185 (7.8%) had no OSA and 2176 (92.2%) had OSA. Atherogenic dyslipidemia prevalence was high (57–66%) in OSA patients, and especially increased in severe OSA compared to other groups (p < 0.05). Though total and LDL-cholesterol did not differ between those with and without OSA, non-HDL-cholesterol (p = 0.020), and triglycerides (p = 0.001) were higher and HDL-cholesterol levels (p = 0.018) were lower in OSA patients than non-OSA. Non-HDL-cholesterol was significantly correlated with OSA severity (p < 0.001) and hypoxia parameters (p < 0.01), whereas LDL-cholesterol showed no correlation.ConclusionsAtherogenic dyslipidemia is highly prevalent and non-HDL-cholesterol levels are significantly increased, predominantly in severe OSA patients. Non-HDL-cholesterol but not LDL-cholesterol, is significantly correlated with OSA severity and hypoxia parameters. Therefore, it could be better to use non-HDL-cholesterol, which is a guideline recommended target of lipid therapy, as a marker of atherosclerotic cardiovascular risk in OSA patients. 相似文献
29.
30.
目的 分析总结南宁市江南区2019年登革热流行病学特征和疫情应急处置的工作情况,为今后有效地防制登革热提供对策、参考和技术支持。方法 收集南宁市江南区2019年登革热疫情相关数据,评价本次应急处置的工作成效。结果 2019年南宁市江南区登革热疫情严峻,共报告登革热病例370例,其中输入病例4例,本地病例366例;感染人数以家务待业和离退休者居多;男女性别比为1∶1.12;发病年龄最小1岁,最大92岁;发病的空间分布呈现高度聚集,福建园街道占本城区本地病例的87.70%。早期伊蚊应急监测布雷图指数和账诱指数合格率偏低,分别为72.17%和62.61%。针对本次疫情特性,制定有针对性的防控策略,做好精准疫情应急处置,有效压低峰值,迅速控制了疫情的扩散和蔓延。结论 本次疫情是由输入性病例导致本地病例社区水平暴发,疫情呈现多点暴发及扩散蔓延态势。需做好疫情研判、预警预测,准确分析流行病学特征,尽早实施登革热应急处置,精准防控、孳生地处理、健康宣教和病例管理是应急处置的关键措施。 相似文献