全文获取类型
收费全文 | 49035篇 |
免费 | 3789篇 |
国内免费 | 117篇 |
专业分类
耳鼻咽喉 | 389篇 |
儿科学 | 2090篇 |
妇产科学 | 1464篇 |
基础医学 | 6456篇 |
口腔科学 | 488篇 |
临床医学 | 6664篇 |
内科学 | 9217篇 |
皮肤病学 | 764篇 |
神经病学 | 4844篇 |
特种医学 | 1027篇 |
外国民族医学 | 38篇 |
外科学 | 4684篇 |
综合类 | 510篇 |
一般理论 | 99篇 |
预防医学 | 7152篇 |
眼科学 | 673篇 |
药学 | 2613篇 |
中国医学 | 85篇 |
肿瘤学 | 3684篇 |
出版年
2024年 | 76篇 |
2023年 | 492篇 |
2022年 | 722篇 |
2021年 | 1534篇 |
2020年 | 921篇 |
2019年 | 1449篇 |
2018年 | 1687篇 |
2017年 | 1228篇 |
2016年 | 1298篇 |
2015年 | 1372篇 |
2014年 | 1916篇 |
2013年 | 2794篇 |
2012年 | 3961篇 |
2011年 | 4064篇 |
2010年 | 2158篇 |
2009年 | 1880篇 |
2008年 | 3398篇 |
2007年 | 3359篇 |
2006年 | 3089篇 |
2005年 | 3027篇 |
2004年 | 2731篇 |
2003年 | 2440篇 |
2002年 | 2288篇 |
2001年 | 304篇 |
2000年 | 193篇 |
1999年 | 307篇 |
1998年 | 456篇 |
1997年 | 342篇 |
1996年 | 292篇 |
1995年 | 301篇 |
1994年 | 256篇 |
1993年 | 225篇 |
1992年 | 132篇 |
1991年 | 136篇 |
1990年 | 119篇 |
1989年 | 101篇 |
1988年 | 108篇 |
1987年 | 76篇 |
1986年 | 97篇 |
1985年 | 104篇 |
1984年 | 117篇 |
1983年 | 102篇 |
1982年 | 121篇 |
1981年 | 158篇 |
1980年 | 105篇 |
1979年 | 64篇 |
1978年 | 57篇 |
1977年 | 60篇 |
1976年 | 58篇 |
1974年 | 55篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
21.
22.
23.
24.
Erin L. Sutfin Jennifer Cornacchione Ross Allison J. Lazard Elizabeth Orlan Cynthia K. Suerken Kimberly D. Wiseman 《Health communication》2019,34(3):343-351
ABSTRACTAdolescents and young adults smoke waterpipe tobacco (WT) and cigarillos, at least in part, based on erroneous beliefs that these products are safer than cigarettes. To address this challenge, we used a systematic, three-phase process to develop a health communication campaign to discourage WT and cigarillo smoking among at-risk (tobacco users and susceptible non-users) 16- to 25-year-olds. In Phase 1, we used a national phone survey (N = 896) to determine salient message beliefs. Participants reported constituents (i.e., harmful chemicals) emitted by the products were worrisome. In Phase 2, we developed and evaluated four message executions, with varying imagery, tone, and unappealing products with the same constituents, using focus groups (N = 38). Participants rated one execution highly, resulting in our development of a campaign where each message: (1) identified a tobacco product and constituent in the smoke; (2) included an image of an unappealing product containing the constituent (e.g., pesticides, gasoline) to grab attention; and (3) used a humorous sarcastic tone. In Phase 3, we tested the campaign messages (17 intervention and six control) with a nationally representative online survey (N = 1,636). Participants rated intervention and control messages highly with few differences between them. Exposure to messages resulted in significant increases in all risk beliefs from pre to post (p < 0.05). For WT, intervention messages increased beliefs about addiction more than control messages (p < 0.05). This systematic, iterative approach resulted in messages that show promise for discouraging WT and cigarillo use. 相似文献
25.
Background Limited research exists on patient knowledge/cognition or “getting inside patients'' heads.” Because patients possess unique and privileged knowledge, clinicians need this information to make patient-centered and coordinated treatment planning decisions. To achieve patient-centered care, we characterize patient knowledge and contributions to the clinical information space. Methods and Objectives In a theoretical overview, we explore the relevance of patient knowledge to care provision, apply historical perspectives of knowledge acquisition to patient knowledge, propose a representation of patient knowledge types across the continuum of care, and include illustrative vignettes about Mr. Jones. We highlight how the field of human factors (a core competency of health informatics) provides a perspective and methods for eliciting and characterizing patient knowledge. Conclusion Patients play a vital role in the clinical information space by possessing and sharing unique knowledge relevant to the clinical picture. Without a patient''s contributions, the clinical picture of the patient is incomplete. A human factors perspective informs patient-centered care and health information technology solutions to support clinical information sharing. 相似文献
26.
James I. Geller MD Joseph G. Pressey MD Malcolm A. Smith MD Rachel A. Kudgus PhD Mariana Cajaiba MD Joel M. Reid PhD David Hall PhD Donald A. Barkauskas PhD Stephen D. Voss MD Steve Y. Cho MD Stacey L. Berg MD Jeffrey S. Dome MD PhD Elizabeth Fox MD Brenda J. Weigel MD 《Cancer》2020,126(24):5303-5310
27.
28.
29.
Martina A. Steurer Jean Costello Rebecca J. Baer Scott P. Oltman Sky K. Feuer Tania Pacheco-Werner Elizabeth Rogers Marta M. Jankowska Jessica Block Molly McCarthy Matthew S. Pantell Christina Chambers Kelli K. Ryckman Laura L. Jelliffe-Pawlowski 《Paediatric and perinatal epidemiology》2020,34(2):130-138
30.
Rubens Souza de OLIVEIRA Lanna Jamile Corrêa da COSTA Fernanda Atanaena Gon?alves de ANDRADE Wilson UIEDA Luzia Fátima Alves MARTORELLI Ana Paula de Arruda Geraldes KATAOKA Elizabeth Salbé Travassos da ROSA Pedro Fernando da Costa VASCONCELOS Armando de Souza PEREIRA Ant?nio Ismael Barros do CARMO Marcus Emanuel Barroncas FERNANDES 《Revista do Instituto de Medicina Tropical de S?o Paulo》2015,57(6):497-503
The outbreaks of rabies in humans transmitted by Desmodus rotundus in 2004 and 2005,
in the northeast of the Brazilian State of Para, eastern Amazon basin, made this a
priority area for studies on this zoonosis. Given this, the present study provides
data on this phenomenon in an urban context, in order to assess the possible
circulation of the classic rabies virus (RABV) among bat species in Capanema, a town
in the Amazon basin. Bats were collected, in 2011, with mist nets during the wet and
dry seasons. Samples of brain tissue and blood were collected for virological and
serological survey, respectively. None of the 153 brain tissue samples analyzed
tested positive for RABV infection, but 50.34% (95% CI: 45.67-55.01%) of the serum
samples analyzed were seropositive. Artibeus planirostris was the most common
species, with a high percentage of seropositive individuals (52.46%, 95% CI: 52.31
52.60%). Statistically, equal proportions of seropositive results were obtained in
the rainy and dry seasons (c2 = 0.057, d.f. = 1, p = 0.88). Significantly
higher proportions of males (55.96%, 95% CI: 48.96-62.96%) and adults (52.37%, 95%
CI: 47.35-57.39%) were seropositive. While none of the brain tissue samples tested
positive for infection, the high proportion of seropositive specimens indicates that
RABV may be widespread in this urban area. 相似文献