全文获取类型
收费全文 | 24878篇 |
免费 | 1750篇 |
国内免费 | 219篇 |
专业分类
耳鼻咽喉 | 67篇 |
儿科学 | 633篇 |
妇产科学 | 510篇 |
基础医学 | 2610篇 |
口腔科学 | 213篇 |
临床医学 | 4694篇 |
内科学 | 2165篇 |
皮肤病学 | 106篇 |
神经病学 | 3397篇 |
特种医学 | 348篇 |
外科学 | 1839篇 |
综合类 | 2300篇 |
一般理论 | 4篇 |
预防医学 | 5488篇 |
眼科学 | 45篇 |
药学 | 1489篇 |
14篇 | |
中国医学 | 241篇 |
肿瘤学 | 684篇 |
出版年
2023年 | 551篇 |
2022年 | 753篇 |
2021年 | 1184篇 |
2020年 | 1237篇 |
2019年 | 1220篇 |
2018年 | 1098篇 |
2017年 | 1098篇 |
2016年 | 1046篇 |
2015年 | 989篇 |
2014年 | 1855篇 |
2013年 | 2406篇 |
2012年 | 1518篇 |
2011年 | 1663篇 |
2010年 | 1282篇 |
2009年 | 1277篇 |
2008年 | 1289篇 |
2007年 | 1177篇 |
2006年 | 903篇 |
2005年 | 665篇 |
2004年 | 555篇 |
2003年 | 446篇 |
2002年 | 354篇 |
2001年 | 288篇 |
2000年 | 253篇 |
1999年 | 221篇 |
1998年 | 148篇 |
1997年 | 159篇 |
1996年 | 106篇 |
1995年 | 122篇 |
1994年 | 106篇 |
1993年 | 88篇 |
1992年 | 68篇 |
1991年 | 61篇 |
1990年 | 41篇 |
1989年 | 42篇 |
1988年 | 43篇 |
1987年 | 29篇 |
1986年 | 34篇 |
1985年 | 60篇 |
1984年 | 58篇 |
1983年 | 35篇 |
1982年 | 36篇 |
1981年 | 37篇 |
1980年 | 39篇 |
1979年 | 42篇 |
1978年 | 28篇 |
1977年 | 20篇 |
1976年 | 21篇 |
1975年 | 19篇 |
1974年 | 24篇 |
排序方式: 共有10000条查询结果,搜索用时 19 毫秒
1.
Kalpani SenevirathnaKalani Hettiarachchi Saman WarnakulasuriyaRuwan Jayasinghe 《Asian Pacific journal of cancer prevention》2022,23(11):3665-3671
Introduction: TikTok has gained increasing popularity over the past year. The social media may affect awareness and perceptions of betel quid (BQ) and smokeless tobacco (SLT) by utilizing content generated by TikTok users. The purpose of this study is to examine how BQ and SLT are portrayed on TikTok. Methods: The 28 most viewed hashtag-based keywords were used to identify popular BQ and SLT-related videos on TikTok (n=513) from June 2018 to September 2021. Two researchers independently coded the number of likes, shares, views, user category and themes. Results: A final sample of 513 videos containing BQ and SLT that met the study criteria were included. Collectively, these videos were viewed over 725 million times, with a median ‘view’ count of 17,300 (range 152–155,000,000) and a median ‘likes’ count of 831 (range 4–2,400,000) and a median ‘share’ count of 21 (range 0–48,400). Majority of the videos showed BQ and SLT use positively i.e promoting the product (390/513; 76%) and these had more than 686 million times views. Neutral depictions of BQ and SLT use were viewed 15 million times (72/513; 14%) and negative portrayals of BQ and SLT have been viewed 193 million times (105/808; 13%). The video themes included ‘life style’ (349/513; 68.0%), ‘marketing’ (62/513; 12.09%), ‘comedy’ (44/513; 8.6%), ‘warning’ (25/513; 4.87%), ‘awareness’ (12/513; 2.3%), ‘sports and other’ (12/513; 2.3%) and social events or culture (9/513; 1.75%). Conclusion: Our results demonstrated that video clips related to BQ and SLT on TikTok, a fast-growing, popular video-sharing platform among teens, which is available with no age restrictions has been viewed multiple times. Majority (76%) promoted these two products, that could be detrimental to oral health. Therefore, the age restrictions especially for the videos containing BQ and SLT is mandatory in order to reduce the potential exposure of adolescents/young adults. 相似文献
2.
3.
《Journal of the Academy of Nutrition and Dietetics》2022,122(12):2288-2294
BackgroundDental caries is the most common chronic childhood disease. Past studies revealed that grandparents provide their grandchildren with cariogenic foods and beverages (eg, those with free sugars and/or modified starches). Qualitative research can help identify what drives this phenomenon.ObjectiveOur aim was to examine mothers’ explanations for why grandparents in north central and central Appalachia give their grandchildren cariogenic foods and beverages.DesignA qualitative study on children’s oral health in Pennsylvania and West Virginia from 2018 through 2020 was performed. In-person, semi-structured interviews were conducted. Qualitative data from interviews were recorded, transcribed, and then coded using NVivo. Data analysis for this study was performed using thematic analysis with iterative theme development.Participants/settingThe participants were 126 mothers of children aged 3-5 years from West Virginia (n = 66) and Pittsburgh, PA (n = 60).Main outcome measuresMothers’ perspectives about why grandparents give their grandchildren cariogenic foods and beverages were analyzed.ResultsIn the study sample, 85% of mothers (n = 107/126) named at least 1 of their children’s grandparents as a member of their social network responsible for their children’s oral health. From these interviews, 85% of mothers (n = 91/107) discussed that grandparents gave their grandchildren cariogenic foods and beverages. The mothers described the following 4 themes to explain why grandparents gave their grandchildren cariogenic foods and beverages: privilege of the grandparent role; responsibilities of the grandparent role; symbol of care and affection; and limited consideration or understanding of the detrimental impact.ConclusionsGrandparents play a role in giving their grandchildren cariogenic foods and beverages, which could potentially contribute to childhood caries. Research is needed to develop effective social interventions to help some grandparents understand the implications of a cariogenic diet on their grandchildren’s oral health and/or decrease their provision of cariogenic foods and beverages. 相似文献
4.
5.
《Health & place》2022
PurposeAccording to the social determinants of health framework, income inequality is a potential risk factor for adverse mental health. However, few studies have explored the mechanisms suspected to mediate this relationship. The current study addresses this gap through a mediation analysis to determine if social support and community engagement act as mediators linking neighbourhood income inequality to maternal anxiety and depressive symptoms within a cohort of new mothers living in the City of Calgary, Canada.MethodsData collected at three years postpartum from mothers belonging to the All Our Families (AOF) cohort were used in the current study. Maternal data were collected between 2012 and 2015 and linked to neighbourhood socioeconomic data from the 2006 Canadian Census. Income inequality was measured using Gini coefficients derived from 2006 after-tax census data. Generalized structural equation models were used to quantify the associations between income inequality and mental health symptoms, and to assess the potential direct and indirect mediating effects of maternal social support and community engagement.ResultsIncome inequality was not significantly associated with higher depressive symptoms (β = 0.32, 95%CI = −0.067, 0.70), anxiety symptoms (β = 0.11, 95%CI = −0.39, 0.60), or lower social support. Income inequality was not associated with community engagement. For the depression models, higher social support was significantly associated with lower depressive symptoms (β = −0.13, 95%CI = −0.15, −0.097), while community engagement was not significantly associated with depressive symptoms (β = 0.059, 95%CI = −0.15, 0.27). Similarly, for the anxiety models, lower anxiety symptoms were significantly associated with higher levels of social support (β = −0.17, 95%CI = −0.20, −0.13) but not with higher levels of community engagement (β = 0.14, 95%CI = −0.14, 0.41).ConclusionThe current study did not find clear evidence for social support or community engagement mediating the relationship between neighbourhood income inequality and maternal mental health. Future investigations should employ a broader longitudinal approach to capture changes in income inequality, potential mediators, and mental health symptomatology over time. 相似文献
6.
《Health & place》2022
Low- and middle-income countries (LMICs) bear the greatest burden of cardiovascular disease (CVD) worldwide. Emerging evidence, mostly from industrialized countries, suggest that neighborhood characteristics influence cardiovascular health. This study presents results from 27,797 participants living in six LMICs on the association of perceived neighborhood social cohesion, the degree of connectedness among neighbors, with 10-year risk of CVD. We observed that greater perceived neighborhood social cohesion was associated with lower odds of high (>20%) 10-year CVD risk (OR = 0.67, 95%CI: 0.53–0.86). These novel findings, suggest that interventions to enhance social cohesion may have beneficial effects on cardiovascular health in LMICs. 相似文献
7.
《Health & place》2022
The Covid-19 pandemic has stimulated new appraisals of how social cohesion, including neighborhood-level social capital, fosters resilience in the face of crisis. Several studies suggest better health outcomes in neighborhoods with higher level of social capital, in general and during the pandemic. Building on a growing body of research which suggests that those who live in close-knit neighborhoods have fared better during the pandemic, this article analyzes how social capital influences individual and collective perceptions and attitudes about the experiences of the Covid-19 pandemic in Tucumán, Argentina. To assess this question, we used a mixed-methods approach, combining focus groups, semi-structured interviews, and an online survey (n = 701 respondents) conducted in September 2021. We find widespread experiences of resilience in response to the Covid-19 pandemic, in spite of difficult socioeconomic conditions and perceived poor government performance. Results from logistic regression analysis indicate that perceptions of high neighborhood social capital are associated with more positive outcomes in many dimensions, including personal resilience, ability to cope with uncertainty, perceptions of community solidarity, and reported compliance with public health measures. We further argue that conceptualizations of social cohesion need to be adjusted to local or national-level cultural norms to accurately capture the experience of countries of the Global South. 相似文献
8.
目的 探讨宫颈癌幸存者社会疏离现状及其影响因素,为实施针对性干预提供参考。方法选取395例宫颈癌幸存者作为研究对象,采用一般情况调查表、一般疏离感量表、社会影响量表、社会支持评定量表进行调查。结果宫颈癌幸存者一般疏离感量表得分(41.98±6.81)分;家庭人均月收入、治疗后时间、病耻感总分、社会支持总分是社会疏离的主要影响因素(均P<0.05),可以解释46.1%的变异量。结论宫颈癌幸存者社会疏离总体水平呈中等偏高。医护人员应关注宫颈癌幸存者的社会疏离水平,尤其是低收入、治疗后时间短的患者,可通过降低患者病耻感和提高患者社会支持水平,降低其社会疏离水平。 相似文献
9.
10.
《Research in social & administrative pharmacy》2022,18(9):3694-3698
In this paper, we argue that understanding and addressing the problem of poor-quality medical products requires a more interdisciplinary approach than has been evident to date. While prospective studies based on rigorous standardized methodologies are the gold standard for measuring the prevalence of poor-quality medical products and understanding their distribution nationally and internationally, they should be complemented by social science research to unpack the complex set of social, economic, and governance factors that underlie these patterns. In the following sections, we discuss specific examples of prospective quality surveys and of social science studies, highlighting the value of cross-sector partnerships in driving high-quality, policy-relevant research in this area. 相似文献