全文获取类型
收费全文 | 5270篇 |
免费 | 395篇 |
国内免费 | 24篇 |
专业分类
耳鼻咽喉 | 40篇 |
儿科学 | 240篇 |
妇产科学 | 129篇 |
基础医学 | 603篇 |
口腔科学 | 59篇 |
临床医学 | 1034篇 |
内科学 | 891篇 |
皮肤病学 | 77篇 |
神经病学 | 345篇 |
特种医学 | 164篇 |
外科学 | 518篇 |
综合类 | 176篇 |
一般理论 | 4篇 |
预防医学 | 695篇 |
眼科学 | 46篇 |
药学 | 355篇 |
中国医学 | 1篇 |
肿瘤学 | 312篇 |
出版年
2023年 | 21篇 |
2022年 | 20篇 |
2021年 | 85篇 |
2020年 | 67篇 |
2019年 | 112篇 |
2018年 | 114篇 |
2017年 | 101篇 |
2016年 | 105篇 |
2015年 | 114篇 |
2014年 | 155篇 |
2013年 | 291篇 |
2012年 | 414篇 |
2011年 | 382篇 |
2010年 | 237篇 |
2009年 | 189篇 |
2008年 | 385篇 |
2007年 | 383篇 |
2006年 | 381篇 |
2005年 | 394篇 |
2004年 | 381篇 |
2003年 | 349篇 |
2002年 | 354篇 |
2001年 | 38篇 |
2000年 | 31篇 |
1999年 | 38篇 |
1998年 | 51篇 |
1997年 | 36篇 |
1996年 | 37篇 |
1995年 | 38篇 |
1994年 | 26篇 |
1993年 | 24篇 |
1992年 | 24篇 |
1991年 | 21篇 |
1990年 | 23篇 |
1989年 | 23篇 |
1988年 | 16篇 |
1987年 | 17篇 |
1986年 | 12篇 |
1985年 | 12篇 |
1984年 | 19篇 |
1983年 | 27篇 |
1982年 | 16篇 |
1981年 | 19篇 |
1980年 | 10篇 |
1979年 | 10篇 |
1978年 | 10篇 |
1974年 | 7篇 |
1973年 | 9篇 |
1972年 | 12篇 |
1971年 | 8篇 |
排序方式: 共有5689条查询结果,搜索用时 31 毫秒
1.
Chloe Andrews Robin Shrestha Shibani Ghosh Katherine Appel Sabi Gurung Lynne M. Ausman Elizabeth Marino Costello Patrick Webb 《Maternal & child nutrition》2022,18(1):e13287
In rural Bangladesh, intake of nutrient-rich foods, such as animal source foods (ASFs), is generally suboptimal. Diets low in nutrients and lacking in diversity put women of reproductive age (WRA) at risk of malnutrition as well as adverse birth outcomes. The objective of this study was to assess the relationship between maternal dietary diversity, consumption of specific food groups and markers of nutritional status, including underweight [body mass index (BMI) < 18.5 kg/m2], overweight (BMI ≥ 23 kg/m2) and anaemia (haemoglobin < 120 g/dl) among WRA in Bangladesh. This analysis used data from the third round of a longitudinal observational study, collected from February through May of 2017. Dietary data were collected with a questionnaire, and Women's Dietary Diversity Score (WDDS) was calculated. Associations between WDDS, food group consumption and markers of nutritional status were assessed with separate adjusted logistic regression models. Among WRA, the prevalence of underweight, overweight and anaemia was 13.38%, 40.94% and 39.99%, respectively. Women who consumed dark green leafy vegetables (DGLV) or eggs were less likely to be anaemic or underweight, respectively, and women who consumed ASFs, particularly fish, were less likely to be underweight compared with women who did not consume these foods. WDDS did not show any consistent relationship with WRA outcomes. Interventions that focus on promoting optimal nutritional status among WRA in Bangladesh should emphasise increasing consumption of specific nutrient-rich foods, including ASFs, DGLV and eggs, rather than solely focusing on improving diet diversity in general. 相似文献
2.
3.
Conall T. Morgan Brigitte Mueller Varsha Thakur Vitor Guerra Callaghan Jull Luc Mertens Mark Friedberg Fraser Golding Mike Seed Steven E.S. Miner Edgar T. Jaeggi Cedric Manlhiot Lynne E. Nield 《The Canadian journal of cardiology》2019,35(4):453-461
Background
The purpose of the study was to evaluate the association between fetal echocardiographic measurements and the need for intervention (primary coarctation repair, staged coarctation repair, or catheter intervention) in prenatally diagnosed coarctation of the aorta.Methods
A single-centre retrospective cohort study (2005-2015) of 107 fetuses diagnosed with suspected coarctation of the aorta in the setting of an apex-forming left ventricle and antegrade flow across the mitral and aortic valves.Results
Median gestational age at diagnosis was 32 weeks (interquartile range, 23-35 weeks). Fifty-six (52%) did not require any neonatal intervention, 51 patients (48%) underwent a biventricular repair. In univariable analysis, an increase in ascending aorta (AAo) peak Doppler flow velocity (odds ratio [OR], 1.40 [95% confidence interval [CI], 1.05-1.91] per 20 cm/s; P = 0.03) was associated with intervention. No intervention was associated with larger isthmus size (OR, 0.23; P < 0.001), transverse arch diameter (OR, 0.23; P < 0.001), and aortic (OR, 0.72; P = 0.02), mitral (OR, 0.58; P = 0.001), and AAo (OR, 0.53; P < 0.001) z-scores. In multivariable analysis, higher peak AAo Doppler (OR, 2.51 [95% CI, 1.54-4.58] per 20 cm/s; P = 0.001) and younger gestational age at diagnosis (OR, 0.81 [95% CI, 0.70-0.93] per week; P = 0.005) were associated with intervention, whereas a higher AAo z-score (OR, 0.65 [95% CI, 0.43-0.94] per z; P = 0.029) and transverse arch dimension (OR, 0.44 [95% CI, 0.18-0.97]; P = 0.05) decreased the risk of intervention.Conclusions
In prenatally suspected coarctation, the variables associated with intervention comprised smaller AAo and transverse arch size, earlier gestational age at diagnosis, and the additional finding of a higher peak AAo Doppler. 相似文献4.
5.
Peter Sainsbury Kate Charlesworth Lynne Madden Anthony Capon Greg Stewart David Pencheon 《Internal medicine journal》2019,49(8):1044-1048
The visit to Australia by Dr David Pencheon, Founding Director of the National Health Service (NHS) Sustainable Development Unit, in April–May 2018 generated considerable interest and engagement. Dr Pencheon's overarching messages were that climate change is a health issue and that doctors and health systems have an opportunity, and responsibility, to lead climate action. This article distils Dr Pencheon's presentations into three themes: (i) carbon accounting; (ii) transformational change in our systems of healthcare; and (iii) a health system fit for the future. For each theme, we highlight promising initiatives that are already underway in Australia that are starting to transform our health system into one fit for a future environmentally sustainable world. We suggest practical ways in which doctors can lead the transformation through personal action and influence broader systems. 相似文献
6.
7.
Cindy Lynne Miller 《Women & health》2020,60(7):763-775
ABSTRACT We explored whether the guilt mothers of young children feel about engaging in health behaviors mediates the relationship between self-compassion and self-reported engagement in health-promoting behaviors such as physical activity, eating a healthy diet and getting enough sleep. In this online, cross-sectional study, 143 mothers of young children completed measures of self-compassion, guilt about taking time to engage in health-promoting behaviors, trait guilt, health-promoting behaviors, self-esteem, and demographics. Mediation analysis, using Hayes’ PROCESS macro showed that mother guilt mediated the relationship between self-compassion and health-promoting behaviors, ß = .05, Bca CI (.0014, .1133) with a bootstrapped standard error of .03 and a 95% confidence interval. Self-compassion may offer mothers a positive way to deal with guilty feelings about looking after their health. 相似文献
8.
9.
Mersedeh Rohanizadegan Sarah Tracy Carolina I. Galarreta Tabitha Poorvu Terry L. Buchmiller Lynne M. Bird Judy A. Estroff Wen‐Hann Tan 《American journal of medical genetics. Part A》2020,182(8):1890-1895
Esophageal atresia (EA) is a congenital anomaly occurring in 2.3 per 10,000 live births. Due to advances in prenatal imaging, EA is more readily diagnosed, but data on the associated genetic diagnoses, other anomalies, and postnatal outcome for fetuses diagnosed prenatally with EA are scarce. We collected data from two academic medical centers (n = 61). Our data included fetuses with suspected EA on prenatal imaging that was confirmed postnatally and had at least one genetic test. In our cohort of 61 cases, 29 (49%) were born prematurely and 19% of those born alive died in the first 9 years of life. The most commonly associated birth defects were cardiac anomalies (67%) and spine anomalies (50%). A diagnosis was made in 61% of the cases; the most common diagnoses were vertebral defects, anal atresia, cardiac anomalies, tracheoesophageal fistula with esophageal atresia, radial or renal dysplasia, and limb anomalies association (43%, although 12% met only 2 of the criteria), trisomy 21 (5%), and CHARGE syndrome (5%). Our findings suggest that most fetuses with prenatally diagnosed EA have one or more additional major anomaly that warrants a more comprehensive clinical genetics evaluation. Fetuses diagnosed prenatally appear to represent a cohort with a worse outcome. 相似文献
10.