全文获取类型
收费全文 | 450640篇 |
免费 | 32677篇 |
国内免费 | 7379篇 |
专业分类
耳鼻咽喉 | 5809篇 |
儿科学 | 9368篇 |
妇产科学 | 10598篇 |
基础医学 | 59504篇 |
口腔科学 | 12933篇 |
临床医学 | 39530篇 |
内科学 | 86997篇 |
皮肤病学 | 9320篇 |
神经病学 | 30012篇 |
特种医学 | 16553篇 |
外国民族医学 | 111篇 |
外科学 | 67115篇 |
综合类 | 26181篇 |
现状与发展 | 19篇 |
一般理论 | 75篇 |
预防医学 | 24465篇 |
眼科学 | 11158篇 |
药学 | 39114篇 |
113篇 | |
中国医学 | 8001篇 |
肿瘤学 | 33720篇 |
出版年
2022年 | 3810篇 |
2021年 | 6055篇 |
2020年 | 4468篇 |
2019年 | 4884篇 |
2018年 | 6652篇 |
2017年 | 5907篇 |
2016年 | 5717篇 |
2015年 | 7360篇 |
2014年 | 10059篇 |
2013年 | 12031篇 |
2012年 | 16399篇 |
2011年 | 17091篇 |
2010年 | 11689篇 |
2009年 | 10380篇 |
2008年 | 14286篇 |
2007年 | 15008篇 |
2006年 | 14531篇 |
2005年 | 12885篇 |
2004年 | 11383篇 |
2003年 | 10962篇 |
2002年 | 10266篇 |
2001年 | 29821篇 |
2000年 | 29847篇 |
1999年 | 24330篇 |
1998年 | 5497篇 |
1997年 | 4616篇 |
1996年 | 4081篇 |
1995年 | 3672篇 |
1994年 | 3262篇 |
1993年 | 2960篇 |
1992年 | 16129篇 |
1991年 | 14889篇 |
1990年 | 14224篇 |
1989年 | 14030篇 |
1988年 | 12616篇 |
1987年 | 12096篇 |
1986年 | 11132篇 |
1985年 | 10349篇 |
1984年 | 6929篇 |
1983年 | 5617篇 |
1982年 | 2729篇 |
1979年 | 5491篇 |
1978年 | 3355篇 |
1977年 | 2980篇 |
1975年 | 2645篇 |
1974年 | 3066篇 |
1973年 | 2867篇 |
1972年 | 2829篇 |
1971年 | 2773篇 |
1969年 | 2543篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
51.
Prevention Science - This study aimed to evaluate the effectiveness of the drug and violence resistance educational program (PROERD) on short-term secondary outcomes, such as intentions to use... 相似文献
52.
53.
54.
目的探讨高血压合并脑卒中患者的血浆同型半胱氨酸(Hcy)水平与其他危险因素对于脑卒中复发的影响。
方法分析徐州市中心医院心内科和徐州医科大学附属医院神经外科自2012年5月至2013年12月收治的1623例高血压脑卒中患者的基线资料,中位随访4.9年,根据随访事件中是否发生脑卒中分为复发组(312例)与未复发组(1311例)。Kaplan-Meier生存分析比较不同危险因素脑卒中复发率的差异,单因素与多因素Cox回归模型分析影响脑卒中复发的独立危险因素,以及危险因素之间的交互作用。
结果复发组年龄、空腹血糖、Lg Hcy的水平,以及糖尿病、房颤的患病率均高于未复发组(P<0.05)。Kaplan-Meier生存分析显示,糖尿病、房颤、年龄≥60岁、空腹血糖≥7.0 mmol/L、Hcy≥15 μmol/L的脑卒中复发率明显升高(Log-rank检验,P<0.05)。多因素Cox回归模型分析显示,高龄、Lg Hcy水平升高,以及房颤、糖尿病是脑卒中复发的独立危险因素。Lg Hcy分别与糖尿病、空腹血糖、年龄存在交互作用。
结论血浆Hcy水平升高既是高血压合并脑卒中患者卒中复发的独立危险因素,又通过与糖尿病、高龄、空腹血糖水平升高的交互作用显著增加脑卒中复发风险。 相似文献
55.
目的 了解2009-2019年西安市肺结核的流行特征及治疗转归情况,为完善西安市肺结核防治策略提供依据。方法 收集2009-2019年《传染病信息管理系统》中登记的肺结核患者病案信息数据,通过描述性研究方法对肺结核流行病学特征和治疗转归情况进行分析。结果 2009-2019年间西安市肺结核年平均发病率为49.06/10万。郊县、郊区、城区肺结核年平均发病率分别为54.13/10万、47.46/10万和46.19/10万;男性发病率是女性的1.85倍。职业分布排在前5位的为农民(47.48%),家政、家务及待业(14.65%),离退人员(9.55%),学生(8.63%)和工人(5.23%)。利福平敏感或耐药性未知患者的成功治疗率平均为98.03%,利福平耐药患者治疗成功率为51.47%。结论 西安市近年来肺结核发病率和治疗率呈增长趋势,利福平耐药患者治疗成功率较低,要加强对重点人群的健康促进工作,加大肺结核发现力度及患者治疗管理工作。 相似文献
56.
57.
Parallel enzyme‐linked immunosorbent assay screening for human immunodeficiency virus among blood donors in five Chinese blood centres: a retrospective analysis
下载免费PDF全文
![点击此处可从《Transfusion medicine (Oxford, England)》网站下载免费的PDF全文](/ch/ext_images/free.gif)
58.
59.
Multidisciplinary predialysis education and team care (MDC) may slow the decline in renal function in patients with chronic kidney disease (CKD). However, associations between unexpected return during MDC and progression of renal dysfunction have not been characterized in patients with CKD. Our study aimed to determine the association between exacerbation of renal dysfunction and the frequency of unexpected return during follow-up.A total of 437 patients with CKD receiving multidisciplinary care between January 2009 and June 2013 at the Shin-Kong Wu Ho-Su Memorial Hospital were included in this retrospective observational cohort study, and multiple imputations were performed for missing data. The predictor was the frequency of unexpected return for follow-up during the first year after entering MDC. Main outcome was monthly declines in estimated glomerular filtration rates (eGFR). Moreover, the demographic data, comorbidities, history of medication, and routine laboratory data for patients with CKD were collected.Among all patients, 59.7% were male, the mean age at initiation of MDC was 69.4 ± 13.2 years, and the duration of follow-up was 21.4 ± 3.3 months. The subjects were divided into 2 groups according to frequencies of follow-up (≤4 and > 4 visits) during the 1st year of MDC. The patients with CKD were regularly followed up every 3 months as a part of MDC in our hospital, and patients who returned for more than 4 follow-up visits were included in the unexpected return group. In crude regression analyses, unexpected return was significantly associated with higher monthly declines of eGFR (β = 0.092, 95% confidence interval, 0.014–0.170). This association remained after adjustments for multiple variables, and subgroup analyses of unexpected return showed that male gender, older age, CKD stage 1 to 3, hypertension, history of coronary artery disease, and use of renin–angiotensin system blockade were significantly associated with declines in renal function.In conclusion, unexpected return for follow-up during the 1st year of MDC was significantly associated with the deterioration of renal function. 相似文献
60.
Harinakshi Sanikini David C. Muller Marisa Sophiea Sabina Rinaldi Antonio Agudo Eric J. Duell Elisabete Weiderpass Kim Overvad Anne Tjønneland Jytte Halkjær Marie-Christine Boutron-Ruault Franck Carbonnel Iris Cervenka Heiner Boeing Rudolf Kaaks Tilman Kühn Antonia Trichopoulou Georgia Martimianaki Anna Karakatsani Valeria Pala Domenico Palli Amalia Mattiello Rosario Tumino Carlotta Sacerdote Guri Skeie Charlotta Rylander María-Dolores Chirlaque López Maria-Jose Sánchez Eva Ardanaz Sara Regnér Tanja Stocks Bas Bueno-de-Mesquita Roel C.H. Vermeulen Dagfinn Aune Tammy Y.N. Tong Nathalie Kliemann Neil Murphy Marc Chadeau-Hyam Marc J. Gunter Amanda J. Cross 《International journal of cancer. Journal international du cancer》2020,146(4):929-942
Obesity has been associated with upper gastrointestinal cancers; however, there are limited prospective data on associations by subtype/subsite. Obesity can impact hormonal factors, which have been hypothesized to play a role in these cancers. We investigated anthropometric and reproductive factors in relation to esophageal and gastric cancer by subtype and subsite for 476,160 participants from the European Prospective Investigation into Cancer and Nutrition cohort. Multivariable hazard ratios (HRs) and 95% confidence intervals (CIs) were estimated using Cox models. During a mean follow-up of 14 years, 220 esophageal adenocarcinomas (EA), 195 esophageal squamous cell carcinomas, 243 gastric cardia (GC) and 373 gastric noncardia (GNC) cancers were diagnosed. Body mass index (BMI) was associated with EA in men (BMI ≥30 vs. 18.5–25 kg/m2: HR = 1.94, 95% CI: 1.25–3.03) and women (HR = 2.66, 95% CI: 1.15–6.19); however, adjustment for waist-to-hip ratio (WHR) attenuated these associations. After mutual adjustment for BMI and HC, respectively, WHR and waist circumference (WC) were associated with EA in men (HR = 3.47, 95% CI: 1.99–6.06 for WHR >0.96 vs. <0.91; HR = 2.67, 95% CI: 1.52–4.72 for WC >98 vs. <90 cm) and women (HR = 4.40, 95% CI: 1.35–14.33 for WHR >0.82 vs. <0.76; HR = 5.67, 95% CI: 1.76–18.26 for WC >84 vs. <74 cm). WHR was also positively associated with GC in women, and WC was positively associated with GC in men. Inverse associations were observed between parity and EA (HR = 0.38, 95% CI: 0.14–0.99; >2 vs. 0) and age at first pregnancy and GNC (HR = 0.54, 95% CI: 0.32–0.91; >26 vs. <22 years); whereas bilateral ovariectomy was positively associated with GNC (HR = 1.87, 95% CI: 1.04–3.36). These findings support a role for hormonal pathways in upper gastrointestinal cancers. 相似文献