全文获取类型
收费全文 | 294篇 |
免费 | 8篇 |
国内免费 | 8篇 |
专业分类
儿科学 | 11篇 |
妇产科学 | 4篇 |
基础医学 | 36篇 |
口腔科学 | 5篇 |
临床医学 | 41篇 |
内科学 | 42篇 |
皮肤病学 | 8篇 |
神经病学 | 7篇 |
特种医学 | 93篇 |
外科学 | 18篇 |
综合类 | 5篇 |
预防医学 | 18篇 |
眼科学 | 2篇 |
药学 | 17篇 |
肿瘤学 | 3篇 |
出版年
2023年 | 1篇 |
2021年 | 2篇 |
2020年 | 3篇 |
2019年 | 6篇 |
2018年 | 1篇 |
2017年 | 3篇 |
2016年 | 1篇 |
2015年 | 5篇 |
2014年 | 6篇 |
2013年 | 3篇 |
2012年 | 6篇 |
2011年 | 2篇 |
2010年 | 20篇 |
2009年 | 11篇 |
2008年 | 7篇 |
2007年 | 12篇 |
2006年 | 12篇 |
2005年 | 6篇 |
2004年 | 2篇 |
2003年 | 4篇 |
2002年 | 2篇 |
2001年 | 3篇 |
2000年 | 2篇 |
1998年 | 18篇 |
1997年 | 19篇 |
1996年 | 13篇 |
1995年 | 11篇 |
1994年 | 13篇 |
1993年 | 13篇 |
1992年 | 2篇 |
1991年 | 4篇 |
1990年 | 3篇 |
1989年 | 9篇 |
1988年 | 8篇 |
1987年 | 6篇 |
1986年 | 10篇 |
1985年 | 6篇 |
1984年 | 3篇 |
1983年 | 2篇 |
1982年 | 7篇 |
1981年 | 2篇 |
1980年 | 8篇 |
1979年 | 5篇 |
1978年 | 3篇 |
1977年 | 7篇 |
1976年 | 7篇 |
1975年 | 9篇 |
1972年 | 2篇 |
排序方式: 共有310条查询结果,搜索用时 0 毫秒
101.
102.
Kristine R. Hearld Adrienne N. Milner Henna Budhwani Nicole Abreau Rosa Mayra Rodriguez-Lauzurique Rebecca Charow 《Substance use & misuse》2019,54(10):1725-1733
Objectives: This study examines associations between alcohol use, high risk sexual behaviors, and experiences of stigma among transgender women across the Dominican Republic. Data from the 2015 Transgender Health Needs Study were analyzed using bivariate analyses (N?=?291). Results: High rates of stigma, verbal abuse, alcohol use, and sex work are found and are associated with each other. Almost 45% of regular alcohol users are engaging in sex work (43.6%), compared with 31.1% of the non-regular alcohol users (χ2=4.82, p?<?.05). Having sex under the influence of alcohol is statistically associated with high risk behaviors, such as engaging in sex work, sometimes or never using a condom when receiving anal sex, and higher numbers of sexual partners. Furthermore, transgender women who have had sex under the influence of alcohol report statistically significantly higher levels of verbal abuse, discrimination, and levels of perceived transgender stigma. Conclusions/Importance: Findings suggest that although anti-discrimination laws exist, policies may not protect transgender women from experiencing stigma and discrimination at work, potentially forcing them to seek alternative careers and engage in behaviors that expose them to greater personal risk and harm. This intersection of factors may indicate a notable public health gap in transgender health in the Dominican Republic. 相似文献
103.
M Salama L. Nahata Y. Jayasinghe V. Gomez-Lobo MM. Laronda MB. Moravek LR. Meacham MS. Christianson M. Lambertini A. Anazodo GP. Quinn TK. Woodruff 《Journal of assisted reproduction and genetics》2023,40(3):443
Purpose As a secondary report to elucidate the diverse spectrum of oncofertility practices for childhood cancer around the globe, we present and discuss the comparisons of oncofertility practices for childhood cancer in limited versus optimum resource settings based on data collected in the Repro-Can-OPEN Study Part I & II.MethodsWe surveyed 39 oncofertility centers including 14 in limited resource settings from Africa, Asia, and Latin America (Repro-Can-OPEN Study Part I), and 25 in optimum resource settings from the USA, Europe, Australia, and Japan (Repro-Can-OPEN Study Part II). Survey questions covered the availability of fertility preservation and restoration options offered in case of childhood cancer as well as their degree of utilization.ResultsIn the Repro-Can-OPEN Study Part I & II, responses for childhood cancer and calculated oncofertility scores showed the following characteristics: (1) higher oncofertility scores in optimum resource settings than in limited resource settings for ovarian and testicular tissue cryopreservation; (2) frequent utilization of gonadal shielding, fractionation of anticancer therapy, oophoropexy, and GnRH analogs; (3) promising utilization of oocyte in vitro maturation (IVM); and (4) rare utilization of neoadjuvant cytoprotective pharmacotherapy, artificial ovary, in vitro spermatogenesis, and stem cells reproductive technology as they are still in preclinical or early clinical research settings.ConclusionsBased on Repro-Can-OPEN Study Part I & II, we presented a plausible oncofertility best practice model to help optimize care for children with cancer in various resource settings. Special ethical concerns should be considered when offering advanced and innovative oncofertility options to children.Supplementary InformationThe online version contains supplementary material available at 10.1007/s10815-022-02679-7. 相似文献
104.
LR Petersen ; GA Satten ; R Dodd ; M Busch ; S Kleinman ; A Grindon ; B Lenes 《Transfusion》1994,34(4):283-289
Background : For persons newly infected with the human immunodeficiency virus type 1 (HIV-1), the time from the onset of infectivity to the development of detectable HIV-1 antibody is unknown. Persons who donate blood during this period account for nearly all instances of HIV-1 transmission from HIV-1 antibody-screened blood transfusions. Study Design and Methods : To estimate the window period from infectivity to HIV-1 antibody positivity, 701 HIV-1-seropositive blood donors who made a previous seronegative donation at 40 United States blood centers were studied. The HIV-1 antibody status was determined for at least one recipient of blood from the seronegative donation preceding the seropositive donation made by 182 of the 701 donors. Results : There were 39 seropositive recipients of blood from these 182 donors. Three donors were excluded from further analysis because the seropositive recipients of their blood had other HIV-1 risk factors or had HIV-1 infection before transfusion. The final study population comprised the remaining 179 donors, of whom 36 (20%) transmitted HIV-1 infection to recipients. When the interval between the seropositive donation and the preceding seronegative donation was less than 180 days, 46 percent of the donors transmitted HIV-1. In contrast, when that interval exceeded 540 days, only 2 percent transmitted HIV-1. A mathematical model was developed to explain the relationship between the probability that the previous seronegative donation occurred during the donor's window period of infectiousness, and hence transmitted HIV-1, as a function of both the window period and the duration between the seropositive and previous seronegative donations. This model indicated that the transmission data were most consistent with an average window period of 45 days. Assuming a log-normal window period distribution, it was estimated with 95 percent certainty that at least 90 percent of persons had a window period of less than 141 days. Conclusion : The window period averages 45 days, with few, if any, donors remaining infectious and seronegative for longer than 6 months. 相似文献
105.
106.
107.
108.
109.