全文获取类型
收费全文 | 4864篇 |
免费 | 110篇 |
国内免费 | 35篇 |
专业分类
耳鼻咽喉 | 70篇 |
儿科学 | 2041篇 |
妇产科学 | 64篇 |
基础医学 | 247篇 |
口腔科学 | 16篇 |
临床医学 | 466篇 |
内科学 | 563篇 |
皮肤病学 | 22篇 |
神经病学 | 165篇 |
特种医学 | 79篇 |
外科学 | 397篇 |
综合类 | 286篇 |
预防医学 | 260篇 |
眼科学 | 12篇 |
药学 | 204篇 |
1篇 | |
中国医学 | 48篇 |
肿瘤学 | 68篇 |
出版年
2024年 | 16篇 |
2023年 | 76篇 |
2022年 | 145篇 |
2021年 | 199篇 |
2020年 | 154篇 |
2019年 | 288篇 |
2018年 | 234篇 |
2017年 | 101篇 |
2016年 | 105篇 |
2015年 | 91篇 |
2014年 | 250篇 |
2013年 | 204篇 |
2012年 | 122篇 |
2011年 | 169篇 |
2010年 | 139篇 |
2009年 | 126篇 |
2008年 | 138篇 |
2007年 | 140篇 |
2006年 | 100篇 |
2005年 | 59篇 |
2004年 | 35篇 |
2003年 | 22篇 |
2002年 | 19篇 |
2001年 | 22篇 |
2000年 | 20篇 |
1999年 | 15篇 |
1998年 | 11篇 |
1997年 | 10篇 |
1996年 | 9篇 |
1995年 | 6篇 |
1994年 | 8篇 |
1993年 | 4篇 |
1991年 | 4篇 |
1990年 | 4篇 |
1988年 | 6篇 |
1987年 | 4篇 |
1986年 | 4篇 |
1985年 | 176篇 |
1984年 | 213篇 |
1983年 | 54篇 |
1982年 | 179篇 |
1981年 | 195篇 |
1980年 | 166篇 |
1979年 | 167篇 |
1978年 | 165篇 |
1977年 | 136篇 |
1976年 | 153篇 |
1975年 | 97篇 |
1974年 | 133篇 |
1973年 | 110篇 |
排序方式: 共有5009条查询结果,搜索用时 578 毫秒
91.
《Vaccine》2015,33(48):6629-6634
ObjectiveTo describe vaccine attitudes among pediatric healthcare providers attending immunization conferences.Study designAttendees of 5 American Academy of Pediatrics (AAP)-sponsored vaccine conferences held between June and November 2013 anonymously completed a questionnaire assessing vaccine attitudes and practices prior to the opening of educational sessions. Pearson's chi-square tests and Fisher's exact tests were used to analyze associations between vaccine attitudes, vaccine practices and provider characteristics.Results680 providers attending AAP-sponsored vaccine conferences were included. 661/666 (99%) enrolled providers state they routinely recommend standard pediatric vaccines, yet, 30 (5%) state that they do not routinely recommend influenza and/or human papillomavirus (HPV) vaccines. These providers expressed vaccine safety (87/680 (13%)) and efficacy (21/680 (31%)) concerns and stated belief in vaccine misperceptions: vaccine causes autism (34/668, 5%), multiple vaccines at a single visit reduces vaccine efficacy (43/680, 6%) or overwhelms the immune system (63/680, 9%), and administering HPV vaccine will increase the likelihood of unprotected adolescent sexual activity (29/680, 4%). Six percent of providers who do not routinely recommend all pediatric vaccines correctly identified themselves as vaccine hesitant.ConclusionVaccine hesitancy is under-recognized among pediatric providers attending AAP-sponsored immunization conferences. Educational interventions tailored to address provider vaccine concerns are needed to improve provider vaccine confidence. 相似文献
92.
Erin K. Willits Miguel A. Park Martha F. Hartz Cathy D. Schleck Amy L. Weaver Avni Y. Joshi 《Mayo Clinic proceedings. Mayo Clinic》2018,93(10):1423-1430
Objective
To determine the incidence and temporal trends of food allergies.Patients and Methods
We performed a historical cohort study to describe the epidemiology of food allergies among residents of all ages in Olmsted County, Minnesota, during a 10-year period from January 2, 2002, through December 31, 2011, using the Rochester Epidemiology Project database. Overall incidence and trends in biannual incidence rates over time were evaluated.Results
During the 10-year study period, 578 new cases of food allergies were diagnosed. The average annual incidence rate was significantly higher among males compared with females (4.1 [95% CI, 3.6-4.5] vs 3.0 [95% CI, 2.7-3.4]; P<.001; per 10,000 person-years; 3.6 per 10,000 person-years overall). The pediatric incidence rate of food allergy increased from 7.0 (95% CI, 6.2-8.9) to 13.3 (95% CI, 10.9-15.7) per 10,000 person-years between the 2002-2003 and 2006-2007 calendar periods and then stabilized at 12.5 and 12.1 per 10,000 person-years in the last 2 calendar periods. Milk, peanut, and seafood were the most common allergen in infancy, in children between ages 1 and 4 years, and in the adult population, respectively.Conclusion
This is one of the first population-based studies to examine the temporal trends of food allergies. The incidence of food allergies increased markedly between 2002 and 2009, with stabilization afterward. Additional longitudinal studies are warranted to assess for epidemiological evidence of changes in food allergy incidence with changing recommendations for allergenic food introduction. 相似文献93.
94.
Carolinna M. Garcia Sandra J. Cunningham 《The American journal of emergency medicine》2018,36(1):105-109
Objectives
In adult patients with blunt trauma, severe mechanism of injury leads to routine pan-computed tomography (CT). Due to concerns about the risk of radiation, we sought to determine whether clinical suspicion could identify children requiring radiographic imaging.Methods
A prospective study was conducted in a pediatric emergency department of a Level 1 trauma center. Patients ≤ 14 years presenting with blunt trauma due to predefined severe mechanisms were eligible. Physicians recorded their suspicions for clinically significant injury (CSI). Imaging was obtained at the physician's discretion. CSI was defined as injury requiring intervention or hospital admission ≥ 24 h. Both admitted and discharged patients were contacted ≥ 2 weeks after presentation to document undetected injuries.Results
837 patients were eligible; 753 were enrolled. 159 patients were excluded because the mechanism did not meet severity criteria. Follow-up was completed for 529/594 remaining patients. Physicians were suspicious of all injuries in 71/75 patients with CSI and had no suspicions in 382/454 without CSI. The 75 injured patients had 153 CSIs; positive suspicion of CSI was recorded for 149 injuries. The four patients who sustained unsuspected injuries had multiple other suspected injuries. Of the 594 patients, 42 received focused CT and 14 underwent pan-CT. No patient had previously undetected injuries on follow-up.Conclusion
In our study, clinical suspicion was able to identify children with CSI. If further studies support our findings, using clinical suspicion rather than mechanism alone to guide radiographic imaging may avoid unnecessary radiation exposure. 相似文献95.
Jonathan S. Schiffman 《The American journal of emergency medicine》2018,36(2):342.e3-342.e5
Patients presenting to the emergency department with chest pain are common and a cause of significant concern to patients and families and physicians alike. The causes of chest pain are myriad. These causes span diverse categories including cardiovascular, respiratory, abdominal and gastrointestinal, musculoskeletal, psychiatric, hematologic and oncologic, and neurologic Thull-Freedman (2010) [1]. These diverse etiologies present a diagnostic and management challenge to the ER physician who is tasked to minimize unnecessary diagnostics while not missing any significant disease. Multiple reviews have discussed the various etiologies of chest pain in the pediatric patient presenting to the ER but none of these recent reviews has included hypokalemia as a cause of chest pain Talner and Carboni (2000), Cava and Sayger (2004), Ringstrom and Freedman (2006), Foy and Filippone (2015), Yeh and Yeh (2015) [2], [3], [4], [5], [6]. Additionally, no reviews of hypokalemia describe this condition presenting with chest pain (Mandal, 1997; Gennari, 2002; Medford-Davis and Rafique, 2014 [7], [8], [9]).This case report describes a pediatric patient who presents with chest pain that was attributed to hypokalemia. This report attempts to make practitioners aware that hypokalemia may present with chest pain and to encourage ER providers to include this in the differential diagnosis. 相似文献
96.
目的:分析我院儿科门诊用药现状,为促进临床合理用药提供建议。方法:从我院儿科门诊2014年1~3月开具的处方中随机抽取1250张进行研究,对儿科疾病构成比、处方用药分布及抗菌药使用情况进行归纳统计,明确儿科门诊中不合理用药情况。结果:我院儿科门诊疾病以上、下呼吸道感染为主,占61.0%(762/1250);抗菌药物使用率为64.0%(800/1250),其中三代头孢药物使用率占18.75%(150/800);800张抗菌处方中,76%为口服中成药,使用率最高,12%为注射剂,均为单联用药。不合理用药以无指征滥用抗菌药物几率最高,达到31.0%,其次为选药不合理及重复用药。结论:我院儿科门诊用药做到中西药并重,抗菌药物使用率高,但给药途径相对合理,三代头孢抗菌药物选择占18.75%,用药起点偏高,易导致耐药菌,需引起注意。 相似文献
97.
98.
99.
100.