全文获取类型
| 收费全文 | 1658665篇 |
| 免费 | 112920篇 |
| 国内免费 | 2594篇 |
专业分类
| 耳鼻咽喉 | 22924篇 |
| 儿科学 | 53780篇 |
| 妇产科学 | 43573篇 |
| 基础医学 | 244814篇 |
| 口腔科学 | 46482篇 |
| 临床医学 | 149890篇 |
| 内科学 | 311924篇 |
| 皮肤病学 | 37617篇 |
| 神经病学 | 123346篇 |
| 特种医学 | 63687篇 |
| 外国民族医学 | 276篇 |
| 外科学 | 248523篇 |
| 综合类 | 34371篇 |
| 现状与发展 | 3篇 |
| 一般理论 | 427篇 |
| 预防医学 | 119789篇 |
| 眼科学 | 38716篇 |
| 药学 | 130552篇 |
| 10篇 | |
| 中国医学 | 4734篇 |
| 肿瘤学 | 98741篇 |
出版年
| 2019年 | 12448篇 |
| 2018年 | 17901篇 |
| 2017年 | 13980篇 |
| 2016年 | 15741篇 |
| 2015年 | 17543篇 |
| 2014年 | 23930篇 |
| 2013年 | 35487篇 |
| 2012年 | 48120篇 |
| 2011年 | 50709篇 |
| 2010年 | 29780篇 |
| 2009年 | 28043篇 |
| 2008年 | 46947篇 |
| 2007年 | 50400篇 |
| 2006年 | 51154篇 |
| 2005年 | 48346篇 |
| 2004年 | 46677篇 |
| 2003年 | 44703篇 |
| 2002年 | 43305篇 |
| 2001年 | 86818篇 |
| 2000年 | 88698篇 |
| 1999年 | 73772篇 |
| 1998年 | 18989篇 |
| 1997年 | 16478篇 |
| 1996年 | 16683篇 |
| 1995年 | 15788篇 |
| 1994年 | 14339篇 |
| 1993年 | 13516篇 |
| 1992年 | 55624篇 |
| 1991年 | 54344篇 |
| 1990年 | 53303篇 |
| 1989年 | 51707篇 |
| 1988年 | 46795篇 |
| 1987年 | 45536篇 |
| 1986年 | 43128篇 |
| 1985年 | 40441篇 |
| 1984年 | 29569篇 |
| 1983年 | 25010篇 |
| 1982年 | 13880篇 |
| 1979年 | 26751篇 |
| 1978年 | 18377篇 |
| 1977年 | 16067篇 |
| 1976年 | 14508篇 |
| 1975年 | 16399篇 |
| 1974年 | 19112篇 |
| 1973年 | 18389篇 |
| 1972年 | 17477篇 |
| 1971年 | 16353篇 |
| 1970年 | 15320篇 |
| 1969年 | 14523篇 |
| 1968年 | 13071篇 |
排序方式： 共有10000条查询结果，搜索用时 15 毫秒
91.
92.
93.
94.
Systematic review with meta‐analysis: online psychological interventions for mental and physical health outcomes in gastrointestinal disorders including irritable bowel syndrome and inflammatory bowel disease 
下载免费PDF全文
下载免费PDF全文 I. Hanlon C. Hewitt K. Bell A. Phillips A. Mikocka‐Walus 《Alimentary pharmacology & therapeutics》2018,48(3):244-259
95.
Javariya Aamir Syed Mustafa Ali Maged N. Kamel Boulos Naveed Anjum Muhammad Ishaq 《Health Policy and Technology》2018,7(1):88-97
Objective
The objective of this review is to identify enabling and inhibiting factors for mHealth adoption in low resource settings, by giving emphasis on the stakeholders representing the caregiving side. Another objective of this study is to support implementation agencies (governmental and non-governmental) in designing scalable mHealth interventions.Methods
A PEO (Population, Exposure, Outcome) approach was used to formulate the review question. A pre-defined search strategy was implemented; Google Scholar, PubMed and gray literature were searched using alternate terms for “mHealth”, “adoption” and “developing countries”. CASP [7] tools were used to assess the quality of selected evidence. After applying inclusion and exclusion criteria on search results and critical appraisal of the selected evidence, twelve studies were selected for the review.Results
Adoption factors operated at the levels of organization, facility-based service provider and frontline health worker. Engagement of end users during design phase, informed clinical decision making, utilization of mHealth evidence, employers’ tolerance of some personal use of devices, automation of tasks and user-friendliness of application are key enabling factors for mHealth adoption in developing countries. On the contrary, absence of national policy on mHealth, poor knowledge base on mHealth, using two systems in parallel, duplication of efforts, poor Internet connectivity and shortage of electricity are important inhibiting factors for mHealth adoption.Conclusions
The review provides an insight about the challenges and opportunities related to mHealth adoption in developing countries. Implementation agencies should give careful consideration to these factors before designing and deploying any mHealth-enabled intervention. It is also important to understand the concept of incremental innovation so that resources spent on pilot interventions are optimized and full potential is achieved. 相似文献96.
Lisa Daniels Rachael W. Taylor Sheila M. Williams Rosalind S. Gibson Samir Samman Benjamin J. Wheeler Barry J. Taylor Elizabeth A. Fleming Nicola K. Hartley Anne-Louise M. Heath 《Journal of the Academy of Nutrition and Dietetics》2018,118(6):1006-1016.e1
Background
Little is known about zinc intakes and status during complementary feeding. This is particularly true for baby-led approaches, which encourage infants to feed themselves from the start of complementary feeding, although self-feeding may restrict the intake of zinc-rich foods.Objective
To determine the zinc intakes, sources, and biochemical zinc status of infants following Baby-Led Introduction to SolidS (BLISS), a modified version of Baby-Led Weaning (BLW), compared with traditional spoon-feeding.Design
Secondary analysis of the BLISS randomized controlled trial.Participants/setting
Between 2012 and 2014, 206 community-based participants from Dunedin, New Zealand were randomized to a Control or BLISS group.Intervention
BLISS participants received eight study visits (antenatal to 9 months) providing education and support regarding BLISS (ie, infant self-feeding from 6 months with modifications to address concerns about iron, choking, and growth).Main outcome measures
Dietary zinc intakes at 7 and 12 months (weighed 3-day diet records) and zinc status at 12 months (plasma zinc concentration).Statistical analyses performed
Regression analyses were used to investigate differences in dietary intakes and zinc status by group, adjusted for maternal education and parity and infant age and sex.Results
There were no significant differences in zinc intakes between BLISS and Control infants at 7 (median: 3.5 vs 3.5 mg/day; P=0.42) or 12 (4.4 vs 4.4 mg/day; P=0.86) months. Complementary food groups contributing the most zinc at 7 months were “vegetables” for Control infants, and “breads and cereals” for BLISS infants, then “dairy” for both groups at 12 months. There was no significant difference in mean±standard deviation plasma zinc concentration between the Control (62.8±9.8 μg/dL [9.6±1.5 μmol/L]) and BLISS (62.8±10.5 μg/dL [9.6±1.6 μmol/L]) groups (P=0.75).Conclusions
BLISS infants achieved similar zinc intake and status to Control infants. However, the BLISS intervention was modified to increase iron intake, which may have improved zinc intake, so these results should not be generalized to infants following unmodified BLW. 相似文献97.
Lindsey Haynes-Maslow Lauri Andress Stephanie Jilcott Pitts Isabel Osborne Barbara Baquero Lisa Bailey-Davis Carmen Byker-Shanks Bailey Houghtaling Jane Kolodinsky Brian K. Lo Emily H. Morgan Emily Piltch Elaine Prewitt Rebecca A. Seguin Alice S. Ammerman 《Journal of the Academy of Nutrition and Dietetics》2018,118(9):1664-1672
Background
In 2016, the US Department of Agriculture (USDA)’s Supplemental Nutrition Assistance Program (SNAP) Retailer Rule proposed several changes for SNAP-authorized retailers, including: requiring retailers to have at least 85% of their food sales come from items that are not cooked or heated on site before or after purchase; requiring stores to stock seven varieties of qualifying foods from four staple food groups; requiring stores to carry perishable foods in three of the four staple groups; requiring stores to carry six units of qualifying foods at all times (depth of stock); disqualifying multiple ingredient foods and accessory foods from counting toward depth of stock requirements.Objectives
To better understand arguments used to support or oppose the USDA’s proposed rule that all SNAP-authorized retailers carry more nutritious foods.Design
We conducted a qualitative content analysis of a random sample of public comments posted to the US Federal Register (a publicly available database) in response to the USDA’s proposed rule.Participants/setting
A random sample of 20% of all public comments submitted by individuals and organizations to the US Federal Register were analyzed (n=303) for this study.Results
Three main themes were discussed: 1) arguments used in opposition to the rule; 2) arguments used in support of the rule; and 3) facilitators to assist stores in implementing the rule. Some of the subthemes included focusing on definitions used in the rule, reduced food access caused by stores leaving the SNAP program, lack of space and equipment for healthy foods, and the potential for increasing healthy food access.Conclusions
Nutrition and dietetics practitioners may be tasked with working with stores to implement healthy changes. Nutrition and dietetics practitioners must understand the role that the USDA has in food policy. In addition, understanding how federal food policy influences the environments in which dietetics professionals’ clients are making food choices is important. 相似文献98.
99.
100.
Joseph J. Knapik Krista G. Austin Emily K. Farina Harris R. Lieberman 《Journal of the Academy of Nutrition and Dietetics》2018,118(8):1370-1388