全文获取类型
收费全文 | 8255篇 |
免费 | 741篇 |
国内免费 | 9篇 |
学科分类
医药卫生 | 9005篇 |
出版年
2022年 | 33篇 |
2021年 | 150篇 |
2020年 | 81篇 |
2019年 | 157篇 |
2018年 | 196篇 |
2017年 | 145篇 |
2016年 | 150篇 |
2015年 | 168篇 |
2014年 | 242篇 |
2013年 | 363篇 |
2012年 | 544篇 |
2011年 | 526篇 |
2010年 | 283篇 |
2009年 | 275篇 |
2008年 | 451篇 |
2007年 | 473篇 |
2006年 | 458篇 |
2005年 | 446篇 |
2004年 | 445篇 |
2003年 | 350篇 |
2002年 | 411篇 |
2001年 | 148篇 |
2000年 | 138篇 |
1999年 | 165篇 |
1998年 | 67篇 |
1997年 | 74篇 |
1996年 | 57篇 |
1995年 | 67篇 |
1994年 | 60篇 |
1993年 | 48篇 |
1992年 | 112篇 |
1991年 | 104篇 |
1990年 | 98篇 |
1989年 | 104篇 |
1988年 | 95篇 |
1987年 | 88篇 |
1986年 | 89篇 |
1985年 | 87篇 |
1984年 | 85篇 |
1983年 | 81篇 |
1982年 | 81篇 |
1981年 | 68篇 |
1980年 | 45篇 |
1979年 | 67篇 |
1978年 | 42篇 |
1977年 | 44篇 |
1976年 | 49篇 |
1974年 | 45篇 |
1972年 | 38篇 |
1968年 | 31篇 |
排序方式: 共有9005条查询结果,搜索用时 15 毫秒
1.
2.
Y. Ermias I.A. Morgan K.M. Curtis M.K. Whiteman L.G. Horton L.B. Zapata 《Contraception》2019,99(5):300-305
ObjectiveIdentify factors associated with healthcare providers' frequency of depot medroxyprogesterone acetate (DMPA) provision to adolescents.Study designWe analyzed data from surveys mailed to a nationally representative sample of public-sector providers and office-based physicians (n=1984). We estimated adjusted odds ratios (aORs) and 95% confidence intervals (CIs) of factors associated with frequent DMPA provision to adolescents in the past year.ResultsAlthough most providers (>95%) considered DMPA safe for adolescents, fewer reported frequent provision (89% of public-sector providers; 64% of office-based physicians). Among public-sector providers, factors associated with lower odds of frequent provision included working in settings without Title X funding (aOR 0.44, 95% CI 0.30–0.64), reporting primary care as their primary clinical focus versus reproductive or adolescent health (aOR 0.42, 95% CI 0.28–0.61), and providing fewer patients with family planning services. Among office-based physicians, factors associated with lower odds of frequent provision included specializing in obstetrics/gynecology (aOR 0.50, 95% CI 0.27–0.91) and family medicine (aOR 0.21, 95% CI 0.09–0.47) versus adolescent medicine, completing training ≥15 versus <5 years ago (aOR 0.27, 95% CI 0.09–0.83), and reporting that 0–24% of patients pay with Medicaid or other government healthcare assistance versus ≥50% (aOR 0.23, 95% CI 0.09–0.61). The reason most commonly reported by providers for infrequent DMPA provision was patient preference for another method.ConclusionsWhile most providers reported frequently providing DMPA to adolescents, training on evidence-based recommendations for contraception, focused on subgroups of providers with lower odds of frequent DMPA provision, may increase adolescents' access to contraception.ImplicationsAlthough >95% of providers considered depot medroxyprogesterone (DMPA) a safe contraceptive for adolescents, only 89% of public-sector providers and 64% of office-based physicians reported frequently providing DMPA to adolescents. Provider training on evidence-based recommendations for contraception counseling and provision may increase adolescents' access to DMPA and all methods of contraception. 相似文献
3.
Nicole D. Facompre Pavithra Rajagopalan Varun Sahu Alexander T. Pearson Kathleen T. Montone Claire D. James Frederico O. Gleber-Netto Gregory S. Weinstein Jalal Jalaly Alexander Lin Anil K. Rustgi Hiroshi Nakagawa Joseph A. Califano Curtis R. Pickering Elizabeth A. White Bradford E. Windle Iain M. Morgan Roger B. Cohen Phyllis A. Gimotty Devraj Basu 《International journal of cancer. Journal international du cancer》2020,147(11):3236-3249
4.
Patients with fibromyalgia (FM) suffer from chronic pain, which limits physical activity and is associated with disturbed sleep. However, the relationship between physical activity, pain and sleep is unclear in these patients. This study examined whether actigraphic (Actiwatch‐2, Philips Respironics) afternoon and evening activity and pain are associated with actigraphic sleep. Adults with FM and insomnia complaints (n = 160, mean age [Mage] = 52, SD = 12, 94% female) completed 14 days of actigraphy. Activity levels (i.e., activity counts per minute) were recorded, and average afternoon/evening activity for intervals 12:00–3:00 PM, 3:00–6:00 PM and 6:00–9:00 PM was computed. Multiple linear regressions examined whether afternoon/evening activity, pain (daily evening diaries from 0 [no pain sensation] to 100 [most intense pain imaginable]), or their interaction, predicted sleep onset latency (SOL), wake time after sleep onset (WASO), total sleep time (TST) and sleep efficiency (SE). Greater afternoon activity was independently associated with lower SE (B = ?0.08, p < .001), lower TST (β = ?0.36, standard error [SE] = 0.06, p < .001) and longer WASO (B = 0.34, p < .001). Greater early evening activity was independently associated with lower SE (B = ?0.06, p < .001), lower TST (β = ?0.26, SE = 0.06, p < .001) and longer WASO (B = 0.23, p < .001). Self‐reported pain intensity interacted with afternoon and early evening physical activity, such that associations between higher activity and lower SE were stronger for individuals reporting higher pain. Late evening activity was not associated with sleep outcomes. Results suggest that in FM, increased afternoon and early evening physical activity is associated with sleep disturbance, and this relationship is stronger in individuals with higher pain. 相似文献
5.
6.
Matthew E. Modes Ruth A. Engelberg Lois Downey Elizabeth L. Nielsen J. Randall Curtis Erin K. Kross 《Journal of pain and symptom management》2019,57(2):251-259
Context
Goals-of-care discussions are associated with improved end-of-life care for patients and therefore may be used as a process measure in quality improvement, research, and reimbursement programs.Objectives
To examine three methods to assess occurrence of a goals-of-care discussion—patient report, clinician report, and documentation in the electronic health record (EHR)—at a clinic visit for seriously ill patients and determine whether each method is associated with patient-reported receipt of goal-concordant care.Methods
We conducted a secondary analysis of a multicenter cluster-randomized trial, with 494 patients and 124 clinicians caring for them. Self-reported surveys collected from patients and clinicians two weeks after a clinic visit assessed occurrence of a goals-of-care discussion. Documentation of a goals-of-care discussion was abstracted from the EHR. Patient-reported receipt of goal-concordant care was assessed by survey two weeks after the visit.Results
Fifty-two percent of patients reported occurrence of a goals-of-care discussion at the clinic visit; clinicians reported occurrence of a discussion at 66% of visits. EHR documentation occurred in 42% of visits (P < 0.001 for each compared with other two). Patients who reported occurrence of a goals-of-care discussion at the visit were more likely to report receipt of goal-concordant care than patients who reported no discussion (β 0.441, 95% CI 0.190–0.692; P = 0.001). Neither occurrence of a discussion by clinician report nor by EHR documentation was associated with goal-concordant care.Conclusion
Different approaches to assess goals-of-care discussions give differing results, yet each may have advantages. Patient report is most likely to correlate with patient-reported receipt of goal-concordant care. 相似文献7.
8.
9.
10.
The last decade has witnessed unparalleled advances in our understanding of the complexity of the oral microbiome and the compositional changes that occur in subgingival biofilms in the transition from health to gingivitis and to destructive periodontal disease. The traditional view, which has held sway for the last 2 decades, that disease is characterized by the outgrowth of a consortium, or consortia, of a limited number of potentially pathogenic organisms, has given way to an alternative paradigm. In this new view, the microbiological changes associated with disease represent whole-scale alterations to the overall microbial population structure and to the functional properties of the entire community. Thus, and in common with other microbially mediated diseases of the gastrointestinal tract, the normally balanced, symbiotic, and generally benign commensal microbiome of the tooth-associated biofilm undergoes dysbiosis to a potentially deleterious microbiota. Coincident with progress in defining the microbiology of these diseases, there have been equally important advances in our understanding of the inflammatory systems of the periodontal tissues, their control, and how inflammation may contribute both to the development of dysbiosis and, in a deregulated state, the destructive disease process. One can therefore speculate that the inflammatory response and the periodontal microbiome are in a bidirectional balance in oral health and a bidirectional imbalance in periodontitis. However, despite these clear insights into both sides of the host/microbe balance in periodontal disease, there remain several unresolved issues concerning the role of the microbiota in disease. These include, but are not limited to, the factors which determine progression from gingivitis to periodontitis in a proportion of the population, whether dysbiosis causes disease or results from disease, and the molecular details of the microbial stimulus responsible for driving the destructive inflammatory response. Further progress in resolving these issues may provide significant benefit to diagnosis, treatment, and prevention. 相似文献