全文获取类型
收费全文 | 3530篇 |
免费 | 176篇 |
国内免费 | 25篇 |
专业分类
耳鼻咽喉 | 37篇 |
儿科学 | 62篇 |
妇产科学 | 58篇 |
基础医学 | 482篇 |
口腔科学 | 283篇 |
临床医学 | 305篇 |
内科学 | 792篇 |
皮肤病学 | 60篇 |
神经病学 | 221篇 |
特种医学 | 102篇 |
外科学 | 503篇 |
综合类 | 18篇 |
一般理论 | 4篇 |
预防医学 | 370篇 |
眼科学 | 36篇 |
药学 | 200篇 |
中国医学 | 15篇 |
肿瘤学 | 183篇 |
出版年
2023年 | 31篇 |
2022年 | 71篇 |
2021年 | 141篇 |
2020年 | 85篇 |
2019年 | 103篇 |
2018年 | 141篇 |
2017年 | 81篇 |
2016年 | 99篇 |
2015年 | 135篇 |
2014年 | 152篇 |
2013年 | 204篇 |
2012年 | 340篇 |
2011年 | 322篇 |
2010年 | 179篇 |
2009年 | 156篇 |
2008年 | 252篇 |
2007年 | 224篇 |
2006年 | 194篇 |
2005年 | 174篇 |
2004年 | 161篇 |
2003年 | 130篇 |
2002年 | 108篇 |
2001年 | 10篇 |
2000年 | 19篇 |
1999年 | 20篇 |
1998年 | 17篇 |
1997年 | 12篇 |
1996年 | 14篇 |
1995年 | 13篇 |
1994年 | 10篇 |
1993年 | 10篇 |
1992年 | 8篇 |
1991年 | 9篇 |
1990年 | 8篇 |
1988年 | 4篇 |
1987年 | 6篇 |
1986年 | 3篇 |
1985年 | 8篇 |
1984年 | 8篇 |
1983年 | 3篇 |
1982年 | 9篇 |
1981年 | 5篇 |
1980年 | 8篇 |
1979年 | 3篇 |
1978年 | 3篇 |
1975年 | 6篇 |
1971年 | 3篇 |
1969年 | 3篇 |
1967年 | 3篇 |
1966年 | 3篇 |
排序方式: 共有3731条查询结果,搜索用时 31 毫秒
81.
Galvão FH Waitzberg DL Bacchella T Gama-Rodrigues J Machado MC 《Arquivos de gastroenterologia》2003,40(2):118-125
BACKGROUND: Significant progress has been made in clinical small bowel transplantation over the last decade mainly due advances in biotechnology and new immunosuppressive regiments. This transplantation has now been indicated to treat special cases of intestinal failure. AIM: This review highlights recent developments in the area of small bowel transplantation. MATERIAL AND METHODS: Over 600 reports on clinical and experimental small bowel transplantation were reviewed. Aspects concerning research development, different immunosuppressive strategies, patient and graft monitoring, and improvements in surgical techniques are discussed. RESULTS: About 700 small bowel transplantation were performed in 55 transplant centers, 44% intestine-liver, 41% isolated intestinal graft and 15% multivisceral transplantation. Rejection and infection are the main limitation of this procedure. Actual 5 years post transplantation graft survival of the total international experience is 46% for isolated intestinal graft, 43% for combined intestine-liver and nearly 30% for multivisceral transplantation. Higher graft and patient survival are seen at the more experienced centers. In a series of 165 intestinal transplantation at University of Pittsburgh, PA, USA, actuarial patient survival was reported to be over 75% at one year, 54% at 5 years and 42% at 10 years. Over 90% patients from Pittsburgh program resume an unrestricted oral diet. CONCLUSION: Small bowel transplantation has advanced from an experimental strategy to a feasible alternative for patients with permanent intestinal failure. Further refinements in graft acceptance, immunosuppressive regiments, infection management and prophylaxis, surgical techniques as well as appropriated patient referral and selection are crucial to improve outcomes. 相似文献
82.
Leticia Leon Lydia Abasolo Benjamin Fernandez-Gutierrez Juan Angel Jover Cesar Hernandez-Garcia 《Reumatología clinica》2018,14(1):4-8
Objective
To analyze the resource utilization in rheumatoid arthritis (RA) patients and predictive factors in and patients treated with biological drugs and biologic-naïve.Methods
A cross-sectional study was performed in a sample including all regions and hospitals throughout the country. Sociodemographic data, disease activity parameters and treatment data were obtained. Resource utilization for two years of study was recorded and we made costs imputation. Correlation analyzes were performed on all RA patients and those treated with biological and biological naïve, to estimate the differences in resource utilization. Factors associated with increased resources utilization (costs) attending to treatment was analyzed by linear regression models.Results
We included 1,095 RA patients, 26% male, mean age of 62 ± 14 years. Mean of direct medical costs per patient was €24,291 ± €45,382. Excluding biological drugs, the average cost per patient was €3,742 ± €3,711. After adjustment, factors associated with direct medical costs for all RA patients were biologic drugs (P = .02) and disease activity (P = .004). In the biologic-naïve group, the predictor of direct medical costs was comorbidity (P < .001). In the biologic treatment group predictors were follow-up length of the disease (P = .04), age (P = .02) and disease activity (P = .007).Conclusion
Our data show a remarkable economic impact of RA. It is important to identify and estimate the economic impact of the disease, compare data from other geographic samples and to develop improvement strategies to reduce these costs and increase the quality of care. 相似文献83.
Ana Paula H. Yokoyama Silvano Wendel Carolina Bonet-Bub Roberta M. Fachini Ana Paula F. Dametto Fernando Blumm Valeria F. Dutra Gabriela T. P. Candelaria Araci M. Sakashita Rafael Rahal Guaragna Machado Rita Fontão-Wendel Nelson Hamerschlak Ruth Achkar Murillo Santucci Cesar Assunção Patrícia Scuracchio Victor Nudelman Laerte Pastore João R. R. Pinho Mirian Dal Ben Roberto Kalil Filho Alexandre R. Marra Mariane T. Amano Esper G. Kallás Alfredo Salim Helito Carlos Roberto Ribeiro de Carvalho Danielle Bastos Araujo Edison Luiz Durigon Anamaria A. Camargo Luiz V. Rizzo Luiz F. L. Reis Jose M. Kutner 《Transfusion》2021,61(8):2295-2306
84.
85.
Merlin Murilo de Oliveira Heloisa Helena Passos Maria Elizabeth Pereira Momesso Cesar Miguel dos Santos de Oliveira Laiane Cristina Santana Juliana Exel Levada-Pires Adriana C. Hatanaka Elaine Massao-Hirabara Sandro Guaré Renata Cury-Boaventura Maria Fernanda Pithon-Curi Tania C. Gorjão Renata 《Sport Sciences for Health》2021,17(2):431-439
Sport Sciences for Health - Lifestyle and body composition may be simultaneously responsible for immune response modulation. This study aimed to compare plasmatic adipokines concentration and... 相似文献
86.
Sandra Rincon Lina P. Carvajal Sara I. Gomez-Villegas Aura M. Echeverri Rafael Rios An Dinh Claudia Pedroza Karen M. Ordoez Esteban Nannini Zhizeng Sun Vance G. Fowler Barbara E. Murray William R. Miller Timothy Palzkill Lorena Diaz Cesar A. Arias Jinnethe Reyes 《Journal of clinical microbiology》2021,59(4)
87.
Alexa Helena Kohler Moresca Nathaly Dias de Moraes Francielle Topolski Carlos Flores-Mir Alexandre Moro Ricardo Cesar Moresca Gisele Maria Correr 《The Angle orthodontist》2020,90(4):571
ObjectiveTo evaluate the esthetic perceptions of orthodontists and laypersons for facial profile changes after orthodontic treatment using Herbst or Forsus appliances.Materials and MethodsPre- and posttreatment facial profile contour images of 20 Class II patients treated with Herbst (group H; n = 10) and Forsus (group F; n = 10) appliances were analyzed by 30 orthodontists and 30 laypersons, who graded them from 1 (unattractive) to 10 (very attractive) using a visual analog scale. Two assessments were carried out with a 15 day-interval. In the first evaluation, 40 images were presented in a random sequence. In the second evaluation, initial and final facial profile images of each patient were randomly presented side by side. To compare groups in relation to treatment method, Mann-Whitney tests were used. To evaluate differences between time points, Wilcoxon tests were used.ResultsIn the first evaluation, there was a significant difference between initial and final images only for group H, for both laypersons (P = .017) and orthodontists (P = .037). There was also a significant difference between laypersons and orthodontists in their ratings of posttreatment Herbst appliance profiles (P = .028). There was no significant difference between initial and final facial profile images for group F and no significant differences between or within evaluator groups in their ratings of initial or final Forsus appliance profiles. In the second evaluation, there was a significant difference between appliance groups only for laypersons, who considered cases treated with the Herbst appliance more attractive than those treated with the Forsus (P = .031). Laypersons also considered Herbst profiles more attractive than did orthodontists (P = .047).ConclusionsClass II malocclusion treatment using the Herbst appliance may produce a more esthetically improved facial profile silhouette compared with Forsus appliances. The magnitude of perceived changes may not be considered clinically relevant. 相似文献
88.
89.
Rodrigo Ca?ada Trofo SURJAN Fábio Ferrari MAKDISSI Marcel Autran Cesar MACHADO 《Brazilian archives of digestive surgery》2015,28(2):128-131
Background
Anatomical liver resections are based on some basic technical principles such as vascular control, ischemic area delineation to be resected and maximum parenchymal preservation. These aspects are achieved by the intrahepatic glissonian approach, which consists in accessing the pedicles of hepatic segments within the hepatic parenchyma. Small incisions on well-defined anatomical landmarks are performed to approach the pedicles, making dissection of the hilar plate unnecessary.Aim
Analyze parameters in liver anatomy related to intrahepatic surgical technique to glissonians pedicles, to set the normal anatomy related to the procedure and thereby facilitate the attainment of this technique.Methods
Anatomical parameters related to the intrahepatic glissonian approach were studied in 37 cadavers. Measurements were performed with precision instruments. Data were expressed as mean±standard deviation. The subjects were divided into groups according to gender and liver weight and groups were compared statistically.Results
Twenty-five cadavers were male and 12 female. No statistically significant difference was observed in virtually all parameters when groups were compared. This demonstrates the consistency of the anatomical parameters related to the intrahepatic glissonian approach.Conclusion
The results obtained in this study made possible major technical advances in the realization of open and laparoscopic hepatectomies with intrahepatic glissonian approach, and can help surgeons to perform liver resections by this method. 相似文献90.
Vanessa dos Santos Grandinétti Eduardo Foschini Miranda Douglas Scott Johnson Paulo Roberto Vicente de Paiva Shaiane Silva Tomazoni Adriane Aver Vanin Gianna Móes Albuquerque-Pontes Lucio Frigo Rodrigo Labat Marcos Paulo de Tarso Camillo de Carvalho Ernesto Cesar Pinto Leal-Junior 《Lasers in medical science》2015,30(5):1575-1581