全文获取类型
收费全文 | 39787篇 |
免费 | 3581篇 |
国内免费 | 820篇 |
专业分类
耳鼻咽喉 | 655篇 |
儿科学 | 606篇 |
妇产科学 | 1211篇 |
基础医学 | 3010篇 |
口腔科学 | 488篇 |
临床医学 | 5277篇 |
内科学 | 4808篇 |
皮肤病学 | 764篇 |
神经病学 | 2213篇 |
特种医学 | 615篇 |
外国民族医学 | 4篇 |
外科学 | 2448篇 |
综合类 | 6180篇 |
现状与发展 | 6篇 |
一般理论 | 3篇 |
预防医学 | 7481篇 |
眼科学 | 441篇 |
药学 | 3266篇 |
50篇 | |
中国医学 | 3349篇 |
肿瘤学 | 1313篇 |
出版年
2024年 | 117篇 |
2023年 | 834篇 |
2022年 | 1278篇 |
2021年 | 2070篇 |
2020年 | 2004篇 |
2019年 | 1678篇 |
2018年 | 1733篇 |
2017年 | 1594篇 |
2016年 | 1755篇 |
2015年 | 1417篇 |
2014年 | 2968篇 |
2013年 | 3533篇 |
2012年 | 2740篇 |
2011年 | 2686篇 |
2010年 | 2128篇 |
2009年 | 1822篇 |
2008年 | 1748篇 |
2007年 | 1742篇 |
2006年 | 1444篇 |
2005年 | 1234篇 |
2004年 | 1074篇 |
2003年 | 1020篇 |
2002年 | 707篇 |
2001年 | 708篇 |
2000年 | 563篇 |
1999年 | 486篇 |
1998年 | 370篇 |
1997年 | 338篇 |
1996年 | 291篇 |
1995年 | 254篇 |
1994年 | 213篇 |
1993年 | 160篇 |
1992年 | 147篇 |
1991年 | 127篇 |
1990年 | 119篇 |
1989年 | 96篇 |
1988年 | 81篇 |
1987年 | 87篇 |
1986年 | 59篇 |
1985年 | 119篇 |
1984年 | 112篇 |
1983年 | 94篇 |
1982年 | 82篇 |
1981年 | 64篇 |
1980年 | 75篇 |
1979年 | 39篇 |
1978年 | 44篇 |
1977年 | 29篇 |
1976年 | 26篇 |
1974年 | 18篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
《台湾医志》2022,121(12):2490-2500
Background/PurposeOrthokeratology (Ortho-K), atropine eye drops and combined atropine with Ortho-K are proven to be effective ways to prevent myopic progression in many studies, but there is scarce evidence regarding the comparative efficacy of different dosages of atropine,Ortho-K, and combined atropine with Ortho-K for childhood myopia.MethodsWe performed a network meta-analysis (NMA) to assess the relative efficacy of the aforementioned interventions for myopic progression; moreover, we calculated the surface under cumulative ranking area (SUCRA) to determine the relative ranking of treatments.ResultsWe identified 19 randomized controlled trials (3435 patients). NMA revealed that 0.01%–1% atropine, Ortho-K, and 0.01% atropine combined with Ortho-K inhibited axial elongation (AL) over one year. For refractive change, SUCRA analysis revealed that the hierarchy was high-dose (0.5%–1%), moderate-dose (0.1%–0.25%), and low-dose (0.01%–0.05%) atropine. Regarding AL, SUCRA analysis revealed the following hierarchy: Ortho-K combined with 0.01% atropine, high-dose atropine, moderate-dose atropine, Ortho-K, and low-dose atropine.ConclusionIn conclusion, we found that atropine (0.01%–1%), Ortho-K, and 0.01% atropine combined with Ortho-K could significantly slow down myopia progression. The atropine efficacy followed a dose-related pattern; moreover, Ortho-K and low-dose atropine showed similar efficacy. There was a synergistic effect of using 0.01% atropine combined with Ortho-K, and it showed comparable efficacy to that of high-dose atropine. 相似文献
2.
3.
Defining con-founders that affect the reliability of diagnostic tests for coronavirus disease 2019 is vital to breaking the chain of infection. The elderly population is a higher risk group for the emerging virus. However, gender seems to exert a critical role in modifying the infection risk among women owing to hormonal changes. The menopause transition is an exceptional period for older women where the protective and immunomodulatory effects of the estrogen hormone are lost. Accordingly, attention should be given to postmenopausal women since they will have an increased risk compared to their pre-menopausal peers. 相似文献
4.
5.
Discrimination towards individuals with disabilities is problematic within nursing. There have been calls to increase diversity in nursing and this includes embracing nurses with disabilities. Increasing diversity in nursing requires increasing diversity among nursing students; in this way, nurse educators are gatekeepers to the profession. Clinical education is a crucial element of nursing education, yet there have been very few studies related to the clinical education of nursing students with disabilities. There have been no studies of attitudes of acute care nurse preceptors toward students with disabilities in the United States. This gap is important as the majority of clinical experiences occur in the acute care environment. Utilizing a focused ethnography, semi-structured interviews were conducted with 20 acute care nurses with at least two years’ experience precepting students. While positive feelings about nursing students with disabilities were shared, thoughts and behavioral intentions remained negative. Six themes emerged: safety, barriers, otherness, communicating to meet needs, disclosure, and student versus colleague. Attitudinal barriers are the primary barriers faced by individuals with disabilities in becoming and practicing as nurses. Nurses in practice and education must embrace more inclusive attitudes towards individuals with disabilities. 相似文献
6.
7.
8.
目的 探讨郑州地区孕妇铁营养状况及其影响因素。方法 以2021年4—8月在郑州市某三家医院建立健康档案并进行孕期体检的孕妇作为研究对象进行问卷调查及铁营养状况检测,采用描述流行病学方法对孕妇铁营养状态进行分析,并采用单、多因素分析方法对孕妇铁缺乏状况影响因素进行分析。结果 共有3 258例孕妇参与本次研究,其中妊娠早期989例,占30.36%,妊娠中期1 125例,占34.53%,妊娠晚期1 144例,占35.11%。在3 258名孕妇中,共有773例为铁缺乏,铁缺乏的检出率为23.73%。多因素分析结果显示,年龄≥35岁(OR=2.726)、处于妊娠的中期或晚期(OR=3.037,3.438)、月经初潮年龄<13岁(OR=2.432)、经产妇(OR=3.493)、流产次数≥3次(OR=2.648)、孕前月经量≥100 mL/次(OR=2.420)、文化程度为初中及以上(OR=0.517,0.459)、居住在农村(OR=3.684)、家庭月收入>3 000元及以上(OR=0.601,0.542)、居住房屋装修时间<1年(OR=6.449)、罹患消化系统疾病(OR=4.716)、有营养补齐剂摄入(OR=0.355)是孕妇铁缺乏的影响因素。结论 郑州市孕妇铁缺乏检出率较高,需要尽早给予针对性的干预。部分因素被确定为该地区孕妇人群发生铁元素缺乏的影响因素,可选择性的对其中危险因素给予干预。 相似文献
9.
《Pancreatology》2022,22(8):1175-1180
BackgroundHepatic steatosis has been described as a common finding in adults following total pancreatectomy with islet autotransplantation (TPIAT) but it is unknown if this occurs in children and adolescents.ObjectivesTo define the frequency of post-TPIAT hepatic steatosis in a sample of children and adolescents and to identify clinical predictors of incident steatosis post-TPIAT.MethodsIn this prospective study, consecutive participants at least 1-month post-TPIAT underwent a liver MRI with proton density fat fraction (PDFF) and blood draw at our pediatric academic medical center between April 2021 and January 2022. Comparison clinical pre-TPIAT liver MRI or ultrasound and insulin use and graft function data were extracted from the medical record. T-tests were used for the comparison of means across continuous variables between participants with and without post-TPIAT steatosis.ResultsA total of 20 participants (mean: 13 ± 4 years; 12 female) were evaluated. Mean liver PDFF at research MRI was 7.4 ± 6.2% (range: 2–25%). Seven participants (35%) had categorical hepatic steatosis (PDFF>5%) post-TPIAT, five of whom had pre-TPIAT steatosis, reflecting a 13% (2/15; 95% CI: 2–40%) incidence of post-TPIAT steatosis. Participant characteristics were not significantly different between subgroups with and without post-TPIAT steatosis. Mean PDFF at research MRI was not different between graft function subgroups (7.5% optimal/good vs. 7.3% marginal/failure; p = .96).ConclusionOur study shows a moderate prevalence but low incidence of hepatic steatosis in a small sample of children and adolescents post-TPIAT. This study raises questions about a causal relationship between TPIAT and hepatic steatosis. 相似文献
10.