全文获取类型
收费全文 | 59092篇 |
免费 | 4764篇 |
国内免费 | 153篇 |
专业分类
耳鼻咽喉 | 494篇 |
儿科学 | 1609篇 |
妇产科学 | 1667篇 |
基础医学 | 8037篇 |
口腔科学 | 1169篇 |
临床医学 | 6150篇 |
内科学 | 11533篇 |
皮肤病学 | 883篇 |
神经病学 | 5917篇 |
特种医学 | 1798篇 |
外科学 | 8965篇 |
综合类 | 959篇 |
现状与发展 | 1篇 |
一般理论 | 51篇 |
预防医学 | 5312篇 |
眼科学 | 1226篇 |
药学 | 4329篇 |
中国医学 | 146篇 |
肿瘤学 | 3763篇 |
出版年
2023年 | 298篇 |
2022年 | 502篇 |
2021年 | 1105篇 |
2020年 | 695篇 |
2019年 | 1048篇 |
2018年 | 1310篇 |
2017年 | 920篇 |
2016年 | 962篇 |
2015年 | 1150篇 |
2014年 | 1729篇 |
2013年 | 2327篇 |
2012年 | 3676篇 |
2011年 | 3833篇 |
2010年 | 2161篇 |
2009年 | 1974篇 |
2008年 | 3455篇 |
2007年 | 3799篇 |
2006年 | 3544篇 |
2005年 | 3376篇 |
2004年 | 3340篇 |
2003年 | 3138篇 |
2002年 | 2903篇 |
2001年 | 1071篇 |
2000年 | 1013篇 |
1999年 | 1001篇 |
1998年 | 673篇 |
1997年 | 616篇 |
1996年 | 578篇 |
1995年 | 516篇 |
1994年 | 458篇 |
1993年 | 429篇 |
1992年 | 735篇 |
1991年 | 684篇 |
1990年 | 590篇 |
1989年 | 670篇 |
1988年 | 590篇 |
1987年 | 539篇 |
1986年 | 570篇 |
1985年 | 490篇 |
1984年 | 445篇 |
1983年 | 471篇 |
1982年 | 362篇 |
1981年 | 332篇 |
1980年 | 273篇 |
1979年 | 327篇 |
1978年 | 296篇 |
1977年 | 273篇 |
1976年 | 243篇 |
1974年 | 228篇 |
1973年 | 240篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
Lauren Tingey Britta Mullany Rachel Chambers Ranelda Hastings Angelita Lee Anthony Parker 《AIDS care》2015,27(9):1087-1097
Potential for widespread transmission of HIV/AIDS among American Indian (AI) adolescents exists, yet no evidence-based interventions (EBIs) have been adapted and evaluated with this population. Intensive psychoeducation may improve knowledge and decision-making which could potentially translate to reductions in HIV risk behaviors. A peer group randomized controlled comparison of an adapted EBI vs. control was delivered over an eight-day summer basketball camp in one reservation-based tribal community to adolescents ages 13–19. Outcome data were gathered immediately post-camp and at 6 and 12 months follow-up. Self-selected peer groups were randomized to intervention (n = 138) or control (n = 129) conditions for a total sample of 267 participants (56.2% female), mean age 15.1 years (SD = 1.7). Intervention participants had better condom use self-efficacy post-camp (Adjusted Mean Difference [AMD] = ?0.75, p < 0.005) and at 6 (AMD = ?0.44, p < 0.005) and 12 months (AMD = ?0.23, p < 0.05) follow-up. Intervention participants also had higher HIV prevention and transmission knowledge (post-camp: AMD = 0.07, p < 0.01; 6 months: AMD = 0.06, p < 0.01) were more likely to believe condoms prevent sexually transmitted infections (post-camp: RR = 1.41, p < 0.005; 6 months: RR = 1.34, p < 0.05), to talk with an adult about HIV/AIDS (post-camp: RR=1.78, p < 0.005; 6 months: RR = 1.14, p < 0.005), had higher partner negotiation efficacy related to substance use during sex (post-camp: AMD = 0.37, p < 0.01), and were more likely to intend to use a condom (post-camp: RR = 1.39, p < 0.01). The adapted intervention had short- and medium-term impacts on AI adolescent risk for HIV/AIDS, but attenuated at 12 months. Intervention delivery through a community-based camp is feasible and acceptable with strong retention. Additional study is needed to evaluate the adapted intervention's impact on sexual risk behaviors and if booster sessions and parent involvement translate to long-term impacts. 相似文献
2.
3.
4.
5.
6.
Andrea Stracciolini Jennifer Luz Gregory Walker Nicholas M. Edwards Avery D. Faigenbaum Gregory D. Myer 《The Physician and sportsmedicine》2020,48(2):199-207
ABSTRACT
Objective
To investigate primary care physician clinical practice patterns, barriers, and education surrounding pediatric physical activity (PA), and to compare practice patterns by discipline. 相似文献7.
Emma J. Walker Noni E. MacDonald Nehal Islam Nicole Le Saux Karina A. Top Deshayne B. Fell 《Vaccine》2019,37(13):1725-1735
Objective
To systematically review literature on uptake and timeliness of diphtheria-tetanus-pertussis, measles-mumps-rubella, and/or polio-containing vaccines in infants who were born preterm, with a low birth weight, and/or with chronic health conditions that were diagnosed within the first 6?months of life.Methods
Using a standardized search strategy developed by a medical librarian, records were extracted from MEDLINE, Embase, Database of Abstracts of Reviews of Effects, and CINAHL up to May 8, 2018.Results
Out of the 1997 records that were screened, we identified 21 studies that met inclusion criteria. Eleven studies assessed vaccine coverage and/or timeliness in preterm infants, 6 in low birth weight infants, and 7 in children with chronic health conditions. Estimates of coverage in these populations were highly variable, ranging from 40% to 100% across the vaccines and population groups.Conclusions
There is a lack of studies reporting coverage and timeliness of routine immunizations in special populations of children.Policy implications
Our review suggests a need for improved surveillance of immunization status in special populations of infants, as well as a need for standardization of reporting practices. 相似文献8.
9.
Denise Lee Marcella D. Walker Hsin Yi Chen John A. Chabot James A. Lee Jennifer H. Kuo 《Surgery》2019,165(1):107-113
Background
Bone mineral density (BMD) has been found to improve after parathyroidectomy (PTX) in patients with primary hyperparathyroidism. There are few data on the effect of PTX on BMD in normocalcemic and normohormonal primary hyperparathyroidism.Methods
A retrospective analysis of 92 primary hyperparathyroidism patients who underwent PTX between 2004 and 2012 with pre- and post-PTX dual-energy x-ray absorptiometry was performed. Within-person changes in BMD pre- and post-PTX were analyzed using log linear mixed models, stratified by biochemical status.Results
Bone mineral density increased post-PTX in the whole cohort at the lumbar spine (+2.5%), femoral neck (+2.1%), and total hip (+1.9%) and decreased at the one-third radius (–0.9%). On comparison of BMD changes by profile, BMD increased in those with the typical profile at the lumbar spine (3.2%), femoral neck (2.9%), and total hip (2.9%) but declined at the one-third radius (–1.5%). In contrast, BMD improved only at the femoral neck (4.3%) in the normohormonal group and did not change at any site in the normocalcemic group. The typical group had a greater increase in BMD over time at the femoral neck and total hip compared with normocalcemic patients.Conclusion
Our results indicate that the skeletal benefit of PTX was attenuated in normocalcemic and normohormonal patients, suggesting that skeletal changes after PTX may depend on biochemical profile. 相似文献10.