首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   3234592篇
  免费   257075篇
  国内免费   6667篇
耳鼻咽喉   45986篇
儿科学   102193篇
妇产科学   89196篇
基础医学   453042篇
口腔科学   92533篇
临床医学   295717篇
内科学   632146篇
皮肤病学   69039篇
神经病学   272092篇
特种医学   126996篇
外国民族医学   1186篇
外科学   484971篇
综合类   78394篇
现状与发展   4篇
一般理论   1334篇
预防医学   262762篇
眼科学   76551篇
药学   236608篇
  5篇
中国医学   6553篇
肿瘤学   171026篇
  2018年   34611篇
  2017年   26564篇
  2016年   29491篇
  2015年   33335篇
  2014年   47996篇
  2013年   72698篇
  2012年   98034篇
  2011年   103656篇
  2010年   61169篇
  2009年   58524篇
  2008年   97401篇
  2007年   103388篇
  2006年   104447篇
  2005年   101616篇
  2004年   97507篇
  2003年   93789篇
  2002年   91761篇
  2001年   150888篇
  2000年   155594篇
  1999年   131044篇
  1998年   38424篇
  1997年   34824篇
  1996年   34473篇
  1995年   33055篇
  1994年   30754篇
  1993年   28815篇
  1992年   103571篇
  1991年   99577篇
  1990年   95905篇
  1989年   92191篇
  1988年   85514篇
  1987年   84110篇
  1986年   79283篇
  1985年   75762篇
  1984年   57827篇
  1983年   49263篇
  1982年   30193篇
  1981年   26860篇
  1979年   53514篇
  1978年   37775篇
  1977年   31684篇
  1976年   29772篇
  1975年   31015篇
  1974年   38146篇
  1973年   36456篇
  1972年   34197篇
  1971年   31446篇
  1970年   29742篇
  1969年   27676篇
  1968年   25630篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
141.
142.
143.
144.
145.
146.
147.
148.
149.

Background

Nursing Home Compare (NHC) ratings, created and maintained by Medicare, are used by both hospitals and consumers to aid in the skilled nursing facility (SNF) selection process. To date, no studies have linked NHC ratings to actual episode-based outcomes. The purpose of this study was to evaluate whether NHC ratings are valid predictors of 90-day complications, readmission, and bundle costs for patients discharged to an SNF after primary total joint arthroplasty (TJA).

Methods

All SNF-discharged primary TJA cases in 2017 at a multihospital academic health system were queried. Demographic, psychosocial, and clinical variables were manually extracted from the health record. Medicare NHC ratings were then collected for each SNF. For patients in the Medicare bundle, postacute and total bundle cost was extracted from claims.

Results

Four hundred eighty-eight patients were discharged to a total of 105 unique SNFs. In multivariate analysis, overall NHC rating was not predictive of 90-day readmission/major complications, >75th percentile postacute cost, or 90-day bundle cost exceeding the target price. SNF health inspection and quality measure ratings were also not predictive of 90-day readmission/major complications or bundle performance. A higher SNF staffing rating was independently associated with a decreased odds for >75th percentile 90-day postacute spend (odds ratio, 0.58; P = .01) and a 90-day bundle cost exceeding the target price (odds ratio = 0.69; P = .02) but was similarly not predictive of 90-day readmission/complications.

Conclusion

Results of our study suggest that Medicare's NHC tool is not a useful predictor of 90-day costs, complications, or readmissions for SNFs within our health system.  相似文献   
150.

Background

Partial nephrectomy (PN) is generally favored for cT1 tumors over radical nephrectomy (RN) when technically feasible. However, it can be unclear whether the additional risks of PN are worth the magnitude of renal function benefit.

Objective

To develop preoperative tools to predict long-term estimated glomerular filtration rate (eGFR) beyond 30 d following PN and RN, separately.

Design, setting, and participants

In this retrospective cohort study, patients who underwent RN or PN for a single nonmetastatic renal tumor between 1997 and 2014 at our institution were identified. Exclusion criteria were venous tumor thrombus and preoperative eGFR <15 ml/min/1.73 m2.

Intervention

RN and PN.

Outcome measurements and statistical analysis

Hierarchical generalized linear mixed-effect models with backward selection of candidate preoperative features were used to predict long-term eGFR following RN and PN, separately. Predictive ability was summarized using marginal RGLMM2, which ranges from 0 to 1, with higher values indicating increased predictive ability.

Results and limitations

The analysis included 1152 patients (13 206 eGFR observations) who underwent RN and 1920 patients (18 652 eGFR observations) who underwent PN, with mean preoperative eGFRs of 66 ml/min/1.73 m2 (standard deviation [SD] = 18) and 72 ml/min/1.73 m2 (SD = 20), respectively. The model to predict eGFR after RN included age, diabetes, preoperative eGFR, preoperative proteinuria, tumor size, time from surgery, and an interaction between time from surgery and age (marginal RGLMM2=0.41). The model to predict eGFR after PN included age, presence of a solitary kidney, diabetes, hypertension, preoperative eGFR, preoperative proteinuria, surgical approach, time from surgery, and interaction terms between time from surgery and age, diabetes, preoperative eGFR, and preoperative proteinuria (marginal RGLMM2). Limitations include the lack of data on renal tumor complexity and the single-center design; generalizability needs to be confirmed in external cohorts.

Conclusions

We developed preoperative tools to predict renal function outcomes following RN and PN. Pending validation, these tools should be helpful for patient counseling and clinical decision-making.

Patient summary

We developed models to predict kidney function outcomes after partial and radical nephrectomy based on preoperative features. This should help clinicians during patient counseling and decision-making in the management of kidney tumors.  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号