全文获取类型
收费全文 | 10808篇 |
免费 | 540篇 |
国内免费 | 86篇 |
学科分类
医药卫生 | 11434篇 |
出版年
2023年 | 54篇 |
2022年 | 88篇 |
2021年 | 301篇 |
2020年 | 164篇 |
2019年 | 266篇 |
2018年 | 328篇 |
2017年 | 246篇 |
2016年 | 273篇 |
2015年 | 300篇 |
2014年 | 406篇 |
2013年 | 520篇 |
2012年 | 788篇 |
2011年 | 777篇 |
2010年 | 401篇 |
2009年 | 445篇 |
2008年 | 640篇 |
2007年 | 634篇 |
2006年 | 625篇 |
2005年 | 652篇 |
2004年 | 582篇 |
2003年 | 551篇 |
2002年 | 510篇 |
2001年 | 155篇 |
2000年 | 152篇 |
1999年 | 154篇 |
1998年 | 109篇 |
1997年 | 100篇 |
1996年 | 71篇 |
1995年 | 66篇 |
1994年 | 67篇 |
1993年 | 46篇 |
1992年 | 96篇 |
1991年 | 85篇 |
1990年 | 74篇 |
1989年 | 52篇 |
1988年 | 66篇 |
1987年 | 57篇 |
1986年 | 72篇 |
1985年 | 56篇 |
1984年 | 38篇 |
1983年 | 45篇 |
1982年 | 35篇 |
1981年 | 33篇 |
1980年 | 28篇 |
1979年 | 31篇 |
1978年 | 28篇 |
1977年 | 21篇 |
1974年 | 20篇 |
1973年 | 16篇 |
1972年 | 24篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
Susan J. Lieff Ari Zaretsky Glen Bandiera Kevin Imrie Salvatore Spadafora Susan Glover Takahashi 《Medical teacher》2016,38(10):1011-1016
Background: Few new Residency Program Directors (PD) are formally trained for the demands and responsibilities of the leadership aspect of their role. Currently, there are no comprehensive frameworks that describe specific leadership competencies that can inform PD self-reflection or faculty development.Methods: The authors developed a Postgraduate Program Director Competency Inventory (PPDCI) in order to frame the performance of PDs for a multisource feedback (MSF) program. The development of the PPDCI occurred in five phases which involved: development of an initial inventory, implementation of a key informant survey of national opinion leaders, execution of a validity survey with postgraduate education leaders and committee members and implementation of a further refined inventory with 17 PD and 147 raters as part of a pilot MSF program.Outcomes: Five distinct domains of leadership competence were identified which included: Communication and relationship management, leadership, professionalism and self-management, environmental engagement, and management skills and knowledge. The content validity of the PPDCI was endorsed by 85% of the key informants. The validity survey indicated strong endorsement of the PPDCI domains and recognition of its utility for both orientation of new PD as well as a frame for self-assessment. The pilot MSF program yielded a further refined and reduced inventory of 26 items of competence as well as recommendations for its utility.Conclusions: Use of this leadership inventory has the potential to ensure effective leadership of postgraduate programs. 相似文献
2.
Angela Mauro Salvatore Mauro Roberto Rega Luigi Martemucci Rita Sottile 《Pediatric dermatology》2019,36(1):e34-e36
Henoch‐Schonlein purpura (HSP) is the most common systemic vasculitis in childhood. There is no consensus about the management for isolated cutaneous manifestations in HSP. We describe a case of HSP presenting with severe skin lesions that did not respond to standard therapy with corticosteroids. The 11‐year‐old child was treated with intravenous immunoglobulins, which induced rapid and persistent resolution of symptomatology. 相似文献
3.
Haya Mohammed BSc MChB M. Yousuf Salmasi MRCS Massimo Caputo PhD Gianni D. Angelini PhD Hunaid A. Vohra PhD 《Journal of cardiac surgery》2020,35(6):1209-1219
Background
Limited data exists demonstrating the efficacy of minimally invasive surgery (MIS) compared to median sternotomy (MS) for multiple valvular disease (MVD). This systematic review and meta-analysis aims to compare operative and peri-operative outcomes of MIS vs MS in MVD.Methods
PubMed, Ovid, and Embase were searched from inception until August 2019 for randomized and observational studies comparing MIS and MS in patients with MVD. Clinical outcomes of intra- and postoperative times, reoperation for bleeding and surgical site infection were evaluated.Results
Five observational studies comparing 340 MIS vs 414 MS patients were eligible for qualitative and quantitative review. The quality of evidence assessed using the Newcastle-Ottawa scale was good for all included studies. Meta-analysis demonstrated increased cardiopulmonary bypass time for MIS patients (weighted mean difference [WMD], 0.487; 95% confidence interval [CI], 0.365-0.608; P < .0001). Similarly, aortic cross-clamp time was longer in patients undergoing MIS (WMD, 0.632; 95% CI, 0.509-0.755; P < .0001). No differences were found in operative mortality, reoperation for bleeding, surgical site infection, or hospital stay.Conclusions
MIS for MVD have similar short-term outcomes compared to MS. This adds value to the use of minimally invasive methods for multivalvular surgery, despite conferring longer operative times. However, the paucity in literature and learning curve associated with MIS warrants further evidence, ideally randomized control trials, to support these findings.4.
5.
Salvatore Greco Beatrice Bonsi Nicol Fabbri 《World Journal of Experimental Medicine》2022,12(5):104-107
Even if the relationships between nutrition and inflammatory bowel disease (IBD) remain underexplored, the current literature is providing, day by day, much more evidence on the effects of various diets in both prevention and treatment of such illnesses. Wrong dietary habits, together with other environmental factors such as pollution, breastfeeding, smoke, and/or antibiotics, are among the theoretical pathogenetic causes of IBD, whose multifactorial aetiology has been already confirmed. While some of these risk factors are potentially reversible, some others cannot be avoided, and efficient treatments become necessary to prevent IBD spread or recurrence. Furthermore, the drugs currently available for treatment of such disease provide low-to-no effect against the symptoms, making the illnesses still strongly disabling. Whether nutrition and specific diets will prove to effectively interrupt the course of IBD has still to be clarified and, in this sense, further research concerning the applications of such dietary interventions is still needed. 相似文献
6.
7.
8.
9.
A Friend is truly a treasure, in accordance with age and competence’s qualitative changes. The aim of this study was to con?rm the increase in friendship competence and its multifactorial nature in 3- up to 10-year-old children, and to verify gender differences, and parenting in?uences on the concept of friendship. A semi-structured interview was administered in a natural context to 3- to 10-year-old children (N?=?167; Mean?=?7.6 years; SD?=?2.16). According to Selman’s Model, the coding provides ?ve sub-categories: (1) friendship; (2) social perspective taking; (3) emotions understanding; (4) social interaction strategies; and (5) aggressiveness. Three parental style questionnaires were administered to parents. Results point up an increase in social skills according to age. The Friendship Interview turned out to be a reliable tool able to investigate how the concept of friendship is also structured in preschool children. 相似文献
10.