全文获取类型
收费全文 | 4290013篇 |
免费 | 352005篇 |
国内免费 | 15321篇 |
专业分类
耳鼻咽喉 | 61075篇 |
儿科学 | 133380篇 |
妇产科学 | 112002篇 |
基础医学 | 656367篇 |
口腔科学 | 118917篇 |
临床医学 | 389195篇 |
内科学 | 777789篇 |
皮肤病学 | 103387篇 |
神经病学 | 367295篇 |
特种医学 | 170991篇 |
外国民族医学 | 913篇 |
外科学 | 653435篇 |
综合类 | 126331篇 |
现状与发展 | 23篇 |
一般理论 | 2589篇 |
预防医学 | 363325篇 |
眼科学 | 100838篇 |
药学 | 302669篇 |
24篇 | |
中国医学 | 11387篇 |
肿瘤学 | 205407篇 |
出版年
2021年 | 55770篇 |
2020年 | 35550篇 |
2019年 | 58708篇 |
2018年 | 73325篇 |
2017年 | 56005篇 |
2016年 | 62323篇 |
2015年 | 75617篇 |
2014年 | 110390篇 |
2013年 | 175753篇 |
2012年 | 118126篇 |
2011年 | 121237篇 |
2010年 | 123112篇 |
2009年 | 126249篇 |
2008年 | 108469篇 |
2007年 | 115046篇 |
2006年 | 124577篇 |
2005年 | 119646篇 |
2004年 | 120524篇 |
2003年 | 111257篇 |
2002年 | 101834篇 |
2001年 | 154576篇 |
2000年 | 150744篇 |
1999年 | 139742篇 |
1998年 | 71358篇 |
1997年 | 67836篇 |
1996年 | 65704篇 |
1995年 | 61556篇 |
1994年 | 55634篇 |
1993年 | 51664篇 |
1992年 | 103765篇 |
1991年 | 99111篇 |
1990年 | 94219篇 |
1989年 | 91831篇 |
1988年 | 85482篇 |
1987年 | 83934篇 |
1986年 | 79603篇 |
1985年 | 78025篇 |
1984年 | 66055篇 |
1983年 | 58957篇 |
1982年 | 48192篇 |
1981年 | 44922篇 |
1980年 | 42210篇 |
1979年 | 57919篇 |
1978年 | 47086篇 |
1977年 | 41640篇 |
1976年 | 38723篇 |
1975年 | 37896篇 |
1974年 | 42485篇 |
1973年 | 40614篇 |
1972年 | 38074篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
Anela Stanic Denis Rybin Francis Cannata Carole Hohl Jennifer Brody Jessie Gaeta 《AIDS care》2021,33(1):1-9
ABSTRACT The lack of stable housing can impair access and continuity of care for patients living with human immunodeficiency virus (HIV). This study investigated the relationship between housing status assessed at multiple time points and several core HIV-related outcomes within the same group of HIV patients experiencing homelessness. Patients with consistently stable housing (CSH) during the year were compared to patients who lacked CSH (non-CSH group). The study outcomes included HIV viral load (VL), CD4 counts, and health care utilization. Multivariable and propensity weighted analyses were used to assess outcomes adjusting for potential group differences. Of 208 patients, 88 (42%) had CSH and 120 (58%) were non-CSH. Patients with CSH had significantly higher proportion of VL suppression and higher mean CD4 counts. The frequency of nurse visits in the CSH group was less than a half of that in the non-CSH group. Patients with CSH were less likely to be admitted to the medical respite facility, and if admitted, their length of stay was about a half of that for the non-CSH group. Our study findings show that patients with CSH had significantly better HIV virologic control and immune status as well as improved health care utilization. 相似文献
2.
3.
4.
5.
Nancy C. Lee 《Public health reports (Washington, D.C. : 1974)》2015,130(2):121-Apr;130(2):121
6.
7.
8.
9.
Jose M. Morales Jose Angel Martinez-Flores Manuel Serrano Maria José Castro Francisco Javier Alfaro Florencio García Miguel Angel Martínez Amado Andrés Esther González Manuel Praga Estela Paz-Artal Antonio Serrano 《Journal of the American Society of Nephrology : JASN》2015,26(3):735-745
In the current immunosuppressive therapy era, vessel thrombosis is the most common cause of early graft loss after renal transplantation. The prevalence of IgA anti–β2-glycoprotein I antibodies (IgA-aB2GPI-ab) in patients on dialysis is elevated (>30%), and these antibodies correlate with mortality and cardiovascular morbidity. To evaluate the effect of IgA-aB2GPI-ab in patients with transplants, we followed all patients transplanted from 2000 to 2002 in the Hospital 12 de Octubre prospectively for 10 years. Presence of IgA-aB2GPI-ab in pretransplant serum was examined retrospectively. Of 269 patients, 89 patients were positive for IgA-aB2GPI-ab (33%; group 1), and the remaining patients were negative (67%; group 2). Graft loss at 6 months post-transplant was significantly higher in group 1 (10 of 89 versus 3 of 180 patients in group 2; P=0.002). The most frequent cause of graft loss was thrombosis of the vessels, which was observed only in group 1 (8 of 10 versus 0 of 3 patients in group 2; P=0.04). Multivariate analysis showed that the presence of IgA-aB2GPI-ab was an independent risk factor for early graft loss (P=0.04) and delayed graft function (P=0.04). There were no significant differences regarding patient survival between the two groups. Graft survival was similar in both groups after 6 months. In conclusion, patients with pretransplant IgA-aB2GPI-ab have a high risk of early graft loss caused by thrombosis and a high risk of delayed graft function. Therefore, pretransplant IgA-aB2GPI-ab may have a detrimental effect on early clinical outcomes after renal transplantation. 相似文献