全文获取类型
收费全文 | 2850篇 |
免费 | 110篇 |
国内免费 | 32篇 |
专业分类
耳鼻咽喉 | 28篇 |
儿科学 | 182篇 |
妇产科学 | 27篇 |
基础医学 | 199篇 |
口腔科学 | 77篇 |
临床医学 | 354篇 |
内科学 | 462篇 |
皮肤病学 | 11篇 |
神经病学 | 287篇 |
特种医学 | 47篇 |
外科学 | 262篇 |
综合类 | 112篇 |
预防医学 | 577篇 |
眼科学 | 17篇 |
药学 | 212篇 |
中国医学 | 22篇 |
肿瘤学 | 116篇 |
出版年
2024年 | 6篇 |
2023年 | 82篇 |
2022年 | 156篇 |
2021年 | 188篇 |
2020年 | 156篇 |
2019年 | 291篇 |
2018年 | 256篇 |
2017年 | 148篇 |
2016年 | 56篇 |
2015年 | 87篇 |
2014年 | 163篇 |
2013年 | 181篇 |
2012年 | 111篇 |
2011年 | 135篇 |
2010年 | 105篇 |
2009年 | 101篇 |
2008年 | 90篇 |
2007年 | 86篇 |
2006年 | 66篇 |
2005年 | 39篇 |
2004年 | 33篇 |
2003年 | 31篇 |
2002年 | 29篇 |
2001年 | 13篇 |
2000年 | 23篇 |
1999年 | 13篇 |
1998年 | 15篇 |
1997年 | 8篇 |
1996年 | 7篇 |
1995年 | 3篇 |
1994年 | 4篇 |
1993年 | 6篇 |
1992年 | 6篇 |
1989年 | 7篇 |
1988年 | 3篇 |
1986年 | 2篇 |
1985年 | 22篇 |
1984年 | 41篇 |
1983年 | 36篇 |
1982年 | 28篇 |
1981年 | 36篇 |
1980年 | 20篇 |
1979年 | 25篇 |
1978年 | 17篇 |
1977年 | 16篇 |
1976年 | 15篇 |
1975年 | 10篇 |
1974年 | 5篇 |
1973年 | 8篇 |
1972年 | 2篇 |
排序方式: 共有2992条查询结果,搜索用时 15 毫秒
21.
《Journal of the Academy of Nutrition and Dietetics》2021,121(4):678-687.e1
BackgroundNationally, approximately one-third of early childhood education centers participating in the Child and Adult Care Food Program (CACFP) are independently owned and operated (ie, not owned by a corporation, not affiliated with Head Start, and with no food program sponsor). Independent providers are less likely to meet CACFP standards and best practices and would benefit from additional support and technical assistance.ObjectiveTo explore independent early childhood education center key informants’ (KIs) (ie, directors or relevant staff) perspectives on implementing the revised CACFP standards.DesignFollowing qualitative exploratory design, semistructured, in-depth, telephone interviews were conducted with KIs individually.Participants/settingIn summer 2018, 30 randomly sampled KIs from independent CACFP-participating early childhood education centers serving children ages 2 to 5 years nationwide were interviewed. Participants were sampled from respondents to a previously completed nationwide survey of providers.Main outcomesKIs’ perspectives on the CACFP program and revised meal pattern standard implementation.Analysis performedAfter audio recordings were professionally transcribed and reviewed, constant comparative analysis was conducted using Atlas.ti v8 qualitative software (Atlas.ti. version 8 for Windows, 2018, Scientific Software Development GmbH).ResultsKIs indicated that program benefits (eg, health and nutrition benefits, reimbursement, guidelines, and training) outweighed challenges experienced. Challenges associated with revised CACFP standards implementation (eg, availability or acceptability of new, creditable foods) were impacted by enhanced CACFP standards status, reported revised standards, and availability or utilization of outside support. KIs desired more contact with their state representative. KIs found the training and technical assistance on the revised standards useful and suggestions to enhance future training and technical assistance (eg, increasing accessibility, training resources, and audience-specific training).ConclusionsOverall, KIs desired additional resources, training, and increased communication from CACFP state representatives specific to CACFP-approved and reimbursable products, menu ideas, recipes, and cooking demonstrations. The present study suggests that a more tailored training and technical assistance approach is necessary as reported benefits, challenges, and program needs varied based on state-enhanced CACFP standards, reported familiarity with the revised meal pattern, and reported outside support. 相似文献
22.
BackgroundThe 30-day all-cause readmission rate is a widely used metric of hospital performance. However, there is lack of clarity as to whether 30 days is an appropriate time frame following surgical procedures. Our aim is to determine whether a 90-day time window is superior to a 30-day time window in capturing surgically relevant readmissions after total hip arthroplasty (THA) and total knee arthroplasty (TKA).MethodsWe analyzed readmissions following all primary THAs and TKAs recorded in the English National Health Service Hospital Episode Statistics database from 2008 to 2018. We compared temporal patterns of 30- and 90-day readmission rates for the following types of readmission: all-cause, surgical, return to theater, and those related to specific surgical complications.ResultsA total of 1.47 million procedures were recorded. After THA and TKA, over three-quarters of 90-day surgical readmissions took place within the first 30 days (78.5% and 75.7%, respectively). All-cause and surgical readmissions both peaked at day 4 and followed a similar temporal course thereafter. The ratio of surgical to medical readmissions was greater for THA than for TKA, with THA dislocation both being one of the most common surgical complications and clustering early after discharge, with 73.5% of 90-day dislocations occurring within the first 30 days.ConclusionThe 30-day all-cause readmission rate is a good reflection of surgically relevant readmissions that take place in the first 90 days after THA and TKA. 相似文献
23.
24.
25.
26.
27.
28.
《Journal of nutrition in gerontology and geriatrics》2013,32(4):41-44
No abstract available for this article. 相似文献
29.
《Vaccine》2017,35(17):2107-2109
In many countries, one of the common factors limiting full and equitable access to effective immunization is the existence of gaps in cold chain and logistics (CCL) systems. This article focuses on the critical contribution that better management of CCL performance can make in addressing these barriers, as well as some essential practices needed to achieve and sustain these gains. These include (i) an emphasis on continuous improvement in CCL performance indicators, (ii) strong coordination and accountability across multiple stakeholders, and (iii) making the most of limited financial resources.This article is informed by the Clinton Health Access Initiative’s (CHAI’s) experience working with National Immunization Programs (NIPs) and immunization partners to improve the effectiveness and efficiency of CCL systems (including CCE deployment and maintenance, temperature monitoring and control, stock management and distribution) across ten Gavi-supported “focus” countries. 相似文献
30.
《International journal of speech-language pathology》2013,15(6):593-603
AbstractThis study explored the effectiveness of the Lidcombe Program for early stuttering in community clinics. Participants were 31 speech-language pathologists (SLPs) using the Lidcombe Program in clinics across Australia, and 57 of their young stuttering clients. Percentage of syllables stuttered (%SS) was collected 9 months after beginning treatment along with information about variables likely to influence outcomes. The mean %SS for the 57 children 9 months after starting treatment was 1.7. The most significant predictor of outcome was Lidcombe Program Trainers Consortium (LPTC) training. The children of trained SLPs (n = 19), compared to the children of untrained SLPs, took 76% more sessions to complete stage 1, but achieved 54% lower %SS scores, 9 months after starting treatment. Results suggest that outcomes for the Lidcombe Program in the general community may be comparable to those obtained in clinical trials when SLPs receive formal training and support. 相似文献