全文获取类型
收费全文 | 6038篇 |
免费 | 603篇 |
国内免费 | 10篇 |
专业分类
耳鼻咽喉 | 43篇 |
儿科学 | 196篇 |
妇产科学 | 153篇 |
基础医学 | 446篇 |
口腔科学 | 208篇 |
临床医学 | 329篇 |
内科学 | 1107篇 |
皮肤病学 | 121篇 |
神经病学 | 443篇 |
特种医学 | 300篇 |
外国民族医学 | 1篇 |
外科学 | 528篇 |
综合类 | 22篇 |
预防医学 | 2135篇 |
眼科学 | 50篇 |
药学 | 263篇 |
中国医学 | 12篇 |
肿瘤学 | 294篇 |
出版年
2023年 | 53篇 |
2022年 | 93篇 |
2021年 | 135篇 |
2020年 | 153篇 |
2019年 | 125篇 |
2018年 | 210篇 |
2017年 | 189篇 |
2016年 | 200篇 |
2015年 | 200篇 |
2014年 | 213篇 |
2013年 | 328篇 |
2012年 | 284篇 |
2011年 | 304篇 |
2010年 | 260篇 |
2009年 | 251篇 |
2008年 | 254篇 |
2007年 | 237篇 |
2006年 | 228篇 |
2005年 | 198篇 |
2004年 | 158篇 |
2003年 | 126篇 |
2002年 | 188篇 |
2001年 | 190篇 |
2000年 | 147篇 |
1999年 | 201篇 |
1998年 | 179篇 |
1997年 | 214篇 |
1996年 | 228篇 |
1995年 | 143篇 |
1994年 | 67篇 |
1993年 | 128篇 |
1992年 | 45篇 |
1991年 | 40篇 |
1990年 | 50篇 |
1989年 | 56篇 |
1988年 | 61篇 |
1987年 | 55篇 |
1986年 | 69篇 |
1985年 | 58篇 |
1984年 | 28篇 |
1983年 | 35篇 |
1982年 | 20篇 |
1981年 | 22篇 |
1980年 | 18篇 |
1979年 | 24篇 |
1978年 | 17篇 |
1977年 | 14篇 |
1976年 | 31篇 |
1973年 | 14篇 |
1972年 | 16篇 |
排序方式: 共有6651条查询结果,搜索用时 15 毫秒
121.
Diana Cardenas MD PhD Gustavo Díaz RD MSc Jessika Cadavid ND MSC Fernando Lipovestky MD Marisa Canicoba RD Paola Sánchez MD Ludwig Álvarez ND Yan Duarte MD José Guillermo Gutiérrez Reyes MD Gilda Miranda de Noyola RD Claudia Maza RD Sergio Santana Porbén MD Charles Elleri Bermúdez MD Yawelida García RN Isabel Calvo RD Humberto Arenas MD 《JPEN. Journal of parenteral and enteral nutrition》2022,46(1):229-237
122.
123.
Dane Christina Daoud MD Elena M. S. Cartagena MD MSc Katherine J. P. Schwenger RD PhD Nicha Somlaw MD Leah Gramlich MD Scott Whittaker MD David Armstrong MD Brian Jurewitsch PharmD Matreyi Raman MD Donald R. Duerksen MD James D. McHattie MD Johane P. Allard MD 《JPEN. Journal of parenteral and enteral nutrition》2022,46(2):348-356
124.
Specific nutrition and metabolic characteristics of critically ill patients with persistent COVID-19
125.
Thainá Gattermann Pereira RD MS Júlia Lima RD Flávia Moraes Silva RD PhD 《JPEN. Journal of parenteral and enteral nutrition》2022,46(5):977-996
Impaired nutrition status is recognized as a risk factor for worse clinical outcomes in patients with chronic obstructive pulmonary disease (COPD). The aims of this study were to investigate how undernutrition is diagnosed, its prevalence, and whether there is an association between this condition and clinical outcomes in patients with COPD. The search for this systematic review of observational studies (PROSPERO: CRD42020191888) was performed in the PubMed, Embase, and Scopus databases, with no date or language restrictions. The studies had to report data on the diagnosis of undernutrition and its association with mortality, exacerbation, length of hospital stay, or quality of life in adult patients with COPD. A meta-analysis with a random-effects model was performed to combine data. Forty-nine studies were included (20 of them classified as having a low risk of bias), and the most common diagnostic method of undernutrition was body mass index (BMI) (n = 36). The pooled prevalence of undernutrition was equal to 20% (95% CI, 0.15–0.25; I² = 100%), and it was associated with mortality (risk ratio = 1.97; 95% CI, 1.55–2.50; I² = 98%), exacerbation (risk ratio = 1.73; 95% CI, 1.03–2.91; I² = 96%), and poorer quality of life (mean difference = 8.25; 95% CI, 5.40–11.10; I² = 79%). For all outcomes, the certainty of evidence was very low. In conclusion, undernutrition is prevalent and is associated with poorer outcomes in patients with COPD. However, undernutrition is mainly diagnosed by BMI, which underreports its prevalence, and the certainty of the evidence is very low. 相似文献
126.
127.
128.
Corey R. Roos PhD Margaret Sala PhD Hedy Kober PhD Irina A. Vanzhula PhD Cheri A. Levinson PhD 《The International journal of eating disorders》2021,54(9):1601-1607
Mindfulness is a two-component skill that includes mindful awareness (attentional monitoring of present moment experience) and mindful acceptance (adopting an attitude of acceptance toward this experience). Although mindfulness-based interventions (MBIs) are efficacious for many conditions, there is a lack of research on MBIs for eating disorders (EDs). We propose that MBIs may be promising for EDs given their potential to mobilize not one, but multiple associative-learning change mechanisms in EDs–defined as adaptive processes of change involving one of two forms of associative-learning: Pavlovian and operant learning. We hypothesize how MBIs–via increasing either mindful awareness or mindful acceptance–may mobilize up to eight associative-learning change mechanisms, two involving Pavlovian learning, and six involving operant learning. We also elaborate on similarities and differences between MBIs and CBT approaches for EDs, as well as opportunities for synergy. Finally, we present recommendations for future research related to the development and evaluation of novel MBI interventions for EDs and the testing of mechanisms and patient-treatment matching hypotheses. 相似文献
129.