全文获取类型
收费全文 | 37220篇 |
免费 | 2235篇 |
国内免费 | 162篇 |
专业分类
耳鼻咽喉 | 506篇 |
儿科学 | 987篇 |
妇产科学 | 797篇 |
基础医学 | 5121篇 |
口腔科学 | 1676篇 |
临床医学 | 3678篇 |
内科学 | 8469篇 |
皮肤病学 | 982篇 |
神经病学 | 3251篇 |
特种医学 | 752篇 |
外科学 | 3796篇 |
综合类 | 191篇 |
一般理论 | 14篇 |
预防医学 | 3735篇 |
眼科学 | 667篇 |
药学 | 2645篇 |
中国医学 | 246篇 |
肿瘤学 | 2104篇 |
出版年
2023年 | 343篇 |
2022年 | 663篇 |
2021年 | 1228篇 |
2020年 | 755篇 |
2019年 | 1115篇 |
2018年 | 1366篇 |
2017年 | 894篇 |
2016年 | 983篇 |
2015年 | 1122篇 |
2014年 | 1531篇 |
2013年 | 1986篇 |
2012年 | 2948篇 |
2011年 | 3118篇 |
2010年 | 1610篇 |
2009年 | 1414篇 |
2008年 | 2295篇 |
2007年 | 2333篇 |
2006年 | 2126篇 |
2005年 | 2036篇 |
2004年 | 1725篇 |
2003年 | 1614篇 |
2002年 | 1460篇 |
2001年 | 491篇 |
2000年 | 519篇 |
1999年 | 468篇 |
1998年 | 260篇 |
1997年 | 231篇 |
1996年 | 182篇 |
1995年 | 160篇 |
1994年 | 151篇 |
1993年 | 143篇 |
1992年 | 277篇 |
1991年 | 199篇 |
1990年 | 195篇 |
1989年 | 171篇 |
1988年 | 133篇 |
1987年 | 100篇 |
1986年 | 127篇 |
1985年 | 129篇 |
1984年 | 89篇 |
1983年 | 75篇 |
1982年 | 64篇 |
1981年 | 60篇 |
1980年 | 68篇 |
1979年 | 65篇 |
1978年 | 71篇 |
1976年 | 44篇 |
1975年 | 42篇 |
1974年 | 47篇 |
1973年 | 47篇 |
排序方式: 共有10000条查询结果,搜索用时 13 毫秒
1.
2.
3.
Iclea Rocha Gama Euclides Marinho Trindade-Filho Suzana Lima Oliveira Nassib Bezerra Bueno Isabelle Tenório Melo Cyro Rego Cabral-Junior Elenita M. Barros Jaqueline A. Galvão Wanessa S. Pereira Raphaela C. Ferreira Bruna R. Domingos Terezinha da Rocha Ataide 《Metabolic brain disease》2015,30(1):93-98
4.
5.
Adilson Cunha Ferreira Edward Araujo Júnior Wellington P. Martins João Francisco Jordão Antônio Hélio Oliani Simon E. Meagher 《The journal of maternal-fetal & neonatal medicine》2015,28(14):1706-1710
Objective: To assess the quality of images and video clips of fetal central nervous (CNS) structures obtained by ultrasound and transmitted via tele-ultrasound from Brazil to Australia.Methods: In this cross-sectional study, 15 normal singleton pregnant women between 20 and 26 weeks were selected. Fetal CNS structures were obtained by images and video clips. The exams were transmitted in real-time using a broadband internet and an inexpensive video streaming device. Four blinded examiners evaluated the quality of the exams using the Likert scale. We calculated the mean, standard deviation, mean difference, and p values were obtained from paired t tests.Results: The quality of the original video clips was slightly better than that observed by the transmitted video clips; mean difference considering all observers = 0.23 points. In 47/60 comparisons (78.3%; 95% CI?=?66.4–86.9%) the quality of the video clips were judged to be the same. In 182/240 still images (75.8%; 95% CI?=?70.0–80.8%) the scores of transmitted image were considered the same as the original.Conclusion: We demonstrated that long distance tele-ultrasound transmission of fetal CNS structures using an inexpensive video streaming device provided images of subjective good quality. 相似文献
6.
Joseane Balan Da Silva Gleison Daion Piovezana Bossolani Camila Piva Greicy Brisa Malaquias Dias Jancarlo Gomes Ferreira Diogo Francisco Rossoni 《International journal of environmental health research》2016,26(5-6):578-588
The spatial distribution of enteroparasitosis in an indigenous village from Paraná was evaluated to identify areas of risk for these infections. A cross-sectional study (from November 2010 to June 2011) was performed using Three Faecal Test® and Kato &; Katz method and a questionnaire on housing and hygiene conditions was administered. Local geostatistical analyses were performed to determine the spatial distribution of intestinal parasitic infections. The overall prevalence of enteroparasites was 67.2?% (457/680), and the most prevalent taxa were Ascaris lumbricoides (48.8?%) and Trichuris trichiura (44.7?%). The prevalence of heavy infection by soil-transmitted helminths was 3.6?% and the families lived in houses with an average of 5.1 residents and < 2 bedrooms per household. The average number of species per individual present spatial heterogeneity with the highest values (≥0.8) in areas with high clustering of residences. The visualization of the spatial distribution of intestinal parasites in this indigenous village is an important contribution to determining health risk areas and planning decisions and services. 相似文献
7.
8.
9.
Maite Cruz Piqueras Ainhoa Rodríguez García de Cortazar Joaquín Hortal Carmona Javier Padilla Bernáldez 《Gaceta sanitaria / S.E.S.P.A.S》2019,33(1)
Objective
To analyse and understand vaccination hesitancy discourses, particularly those of people who have decided not to vaccinate their sons and daughters.Methods
Qualitative study of five individual interviews and two focus groups with people who chose not to vaccinate their children in the province of Granada (Spain).Results
Mothers and fathers manifest a system of health beliefs different to the biomedical paradigm. From an ethical point of view, they justify their position based on the right to autonomy and responsibility for their decisions. Alleged specific reasons: they doubt administration of several vaccines simultaneously at an early age in a systematic way and without individualising each case; they fear adverse effects and do not understand the variations of the vaccination schedule.Conclusions
These vaccination hesitancy discourses respond to the individual vs collective conflict; parents defend their right to bring up their children without any interference from the state and focus their responsibility on the individual welfare of their sons and daughters, regardless of the consequences that their actions might have on the collective. In their management of risks, they consider those derived from vaccination more relevant than the individual or collective consequences of not doing so. The vaccines generating most doubts are the more controversial ones within the scientific world. Transparency in communication of adverse effects; authorities respect for other health/disease concepts; banishment of the term “anti-vaccines” from the media and scientific vocabulary, and developing spaces for dialogue are bridges to be built. 相似文献10.
Flavia M. N. P. Aslanian Maria Teresa Q. Marques Haroldo J. Matos Luciane F. S. Pontes Luis Cristvo S. Porto Lucia M. S. Azevedo Absalom L. Filgueira 《Journal der Deutschen Dermatologischen Gesellschaft》2006,4(10):842-847
Background: Lichen sclerosus (LS) has been identified with increased frequency in families,often associated with HLA markers, mainly DQ7. A genetic co‐etiology seems likely in this setting. Moreover, there is an association of LS with autoimmune disorders, such as the presence of anti‐thyroid peroxidase autoantibodies (anti‐TPO), a hallmark of autoimmune thyroid diseases. Patients and Methods: In 3 families affected by LS, we verified their HLA markers, and identified previously undiagnosed cases of LS and autoimmune disorders. 30 individuals were examined with history, skin biopsy, HLA class I and II typing by PCR‐SSP, and measurement of anti‐TPO, free thyroxine and thyroidstimulating hormones (TSH) levels. Results: There were 8 cases of LS, 50 % of them anti‐TPO+. Autoimmune disorders were found in 40 % (total) and in 87.5 % of those affected. Most common HLA markers were B*15, B*57, CW*03, CW*07, CW*18, DRB1*04, DRB1*07, DRB4*. The three latter have been previously associated with LS. Conclusion: New cases of LS and autoimmune disorders can be detected in first degree relatives of patients with LS. The presence of anti‐TPO antibodies strongly suggests autoimmune thyroiditis. There is intra‐familial association between the haplotype HLA‐B*15 ‐DRB1*04 ‐DRB4* and anti‐TPO,emphasizing their link with thyroiditis. New familial approaches might help to make clear the pathogenesis of LS and its association with autoimmune diseases. 相似文献