全文获取类型
收费全文 | 8082篇 |
免费 | 348篇 |
国内免费 | 19篇 |
专业分类
耳鼻咽喉 | 149篇 |
儿科学 | 228篇 |
妇产科学 | 227篇 |
基础医学 | 1259篇 |
口腔科学 | 122篇 |
临床医学 | 589篇 |
内科学 | 1372篇 |
皮肤病学 | 250篇 |
神经病学 | 929篇 |
特种医学 | 394篇 |
外国民族医学 | 9篇 |
外科学 | 1391篇 |
综合类 | 30篇 |
一般理论 | 2篇 |
预防医学 | 329篇 |
眼科学 | 130篇 |
药学 | 590篇 |
中国医学 | 25篇 |
肿瘤学 | 424篇 |
出版年
2023年 | 40篇 |
2022年 | 41篇 |
2021年 | 94篇 |
2020年 | 68篇 |
2019年 | 103篇 |
2018年 | 130篇 |
2017年 | 108篇 |
2016年 | 135篇 |
2015年 | 143篇 |
2014年 | 187篇 |
2013年 | 245篇 |
2012年 | 403篇 |
2011年 | 433篇 |
2010年 | 269篇 |
2009年 | 243篇 |
2008年 | 420篇 |
2007年 | 378篇 |
2006年 | 381篇 |
2005年 | 377篇 |
2004年 | 374篇 |
2003年 | 397篇 |
2002年 | 324篇 |
2001年 | 266篇 |
2000年 | 282篇 |
1999年 | 235篇 |
1998年 | 74篇 |
1997年 | 63篇 |
1996年 | 72篇 |
1995年 | 55篇 |
1994年 | 56篇 |
1993年 | 54篇 |
1992年 | 137篇 |
1991年 | 143篇 |
1990年 | 142篇 |
1989年 | 123篇 |
1988年 | 113篇 |
1987年 | 87篇 |
1986年 | 88篇 |
1985年 | 101篇 |
1984年 | 80篇 |
1983年 | 71篇 |
1979年 | 58篇 |
1977年 | 52篇 |
1975年 | 38篇 |
1974年 | 42篇 |
1973年 | 47篇 |
1972年 | 38篇 |
1971年 | 51篇 |
1970年 | 39篇 |
1967年 | 37篇 |
排序方式: 共有8449条查询结果,搜索用时 15 毫秒
1.
2.
3.
4.
5.
Background Context
Long-term follow-up of patient-reported outcome measures (PROM) is essential in both modern spinal care and research. Lack of time and staff are commonly reported barriers to implementing long-term follow-up of PROM. Automated and digital follow-up systems for PROM collection are seeing widespread use, yet their validity and comparative effectiveness have never been evaluated.Purpose
The present study aimed to assess the validity of digital follow-up systems in comparison with the conventional paper-based follow-up (PB-FU).Study Design
This is a retrospective analysis of prospectively collected double follow-up data.Patient Sample
Patients who underwent lumbar spinal fusion for spondylolisthesis or degenerative disc disease between 2013 and 2016 were included in the study.Outcome Measures
The study determined the Oswestry Disability Index (ODI) and Numeric Rating Scale (NRS) for back and leg pain severity at baseline, 6 weeks, 12 months, and 24 months.Materials and Methods
After lumbar spinal fusion surgery, a double follow-up of PROM was carried out by conventional PB-FU during clinical visits, while simultaneously completing an automatically dispatched digital follow-up questionnaire. As the primary end point, we assessed the intraindividual discrepancy in PROM between PB-FU and automated digital follow-up (AD-FU).Results
Forty patients completed all parts of the dual follow-up trajectory and were analyzed. We detected no discrepancy in ODI or NRS for back and leg pain severity at any of the baseline, 6-week, 12-month, or 24 month follow-ups (all p>.05). This was confirmed in a sensitivity analysis.Conclusions
In an analysis of dual paper-based and digital follow-up after lumbar fusion surgery, patients report highly similar values using either method of follow-up. It appears that AD-FU without incentives produces lower response rates. To reassess the validity of these systems for data collection in spinal patient care, a prospective validation with higher statistical power is warranted. 相似文献6.
Reported in this paper are postoperative results recorded from 120 patients, 3 years after selective proximal vagotomy for uncomplicated duodenal ulcer. There was no intraoperative lethality and no recurrence in 96.7 per cent of all cases, while Visick grades I on II were recorded from 98.2 per cent. Radiologically and gastroscopically detected pathological processes receded soon. Average postoperative reduction in acid secretion was 66.2 per cent in BAO and 46.8 per cent in MAO. Acid values re-increased thereafter, and three years later reduction rates still amounted to 43.7 per cent in BAO and 28.6 per cent in MAO. Indications for proximal gastric vagotomy are discussed in some detail. 相似文献
7.
We found that thirteen per cent of all head and neck malignomas are malignant lymphomas. In 75% of these cases the Non-Hodgkin type could be found. The major salivary glands were involved by the lymphoma in 55% out of 104 patients. Paraglandular lymph nodes of the parotid gland were affected as well as intraglandular lymph nodes and the lymphoid tissue within the gland proper. The submandibular gland normally shows an involvement only with its paraglandular lymph nodes. Two thirds of the Non-Hodgkin lymphomas located in the salivary glands were low-grade. In case of clinical suspicion of a malignant lymphoma, fine needle biopsy is required for cytological diagnosis. However, surgery is mandatory for histological diagnosis, not as a therapeutic measure. 相似文献
8.
Ernst R. Kuse Joerg Kotzerke Silke Müller Björn Nashan Rainer Lück Karsten Jaeger 《Transplant international》2002,15(6):272-277
It has been demonstrated that total parenteral nutrition (TPN) modulates the function of the hepatic reticuloendothelial system (RES). The objective of this study was to evaluate the impact of two different TPN lipid emulsions on the recovery of allograft RES function after orthotopic liver transplantation (OLTx). In a prospective, double-blind study, OLTx patients were randomly assigned to two treatment groups. Group I ( n=13) received a TPN regimen that included long-chain triglycerides (LCT). Group II ( n=9) received a TPN regimen that included a fat emulsion consisting of both medium-chain triglycerides (MCT) and LCT. At baseline, i.e., on days 2 or 3 after OLTx ( t1), before lipids for TPN were started, hepatic RES function was determined using the human serum albumin millimicrosphere technique (K-value, 1/min). A second measurement ( t2) was obtained after 7 days of TPN, including one of the study's two fat emulsions. The mean (+/- SD) K-value (1/min) was 0.48+/-0.16 in the LCT group and 0.55+/-0.28 in the MCT/LCT group at t1, and it improved to 0.62+/-0.21 in the LCT group and to 0.86+/-0.32 in the MCT/LCT group at t2. RES function recovery was significantly better in the MCT/LCT group ( P< or = 0.05). MCT/LCT emulsion appears to be the TPN fat emulsion of choice after OLTx as it seems to have less impact on hepatic RES recovery. 相似文献
9.
U. Bolm-Audorff S. Brandenburg T. Brüning H. Dupuis R. Ellegast G. Elsner K. Franz H. Grasshoff V. Grosser L. Hanisch B. Hartmann E. Hartung K. G. Hering G. Heuchert M. Jäger J. Krämer Dr. A. Kranig E. Ludolph A. Luttmann A. Nienhaus W. Pieper K.-D. Pöhl T. Remé D. Riede G. Rompe K. Schäfer S. Schilling E. Schmitt F. Schröter A. Seidler M. Spallek M. Weber 《Trauma und Berufskrankheit》2005,7(3):211-252
Occupational diseases Nos. 2108 and 2110 correspond to intervertebral disc-related diseases of the lumbar spine from many years of carrying or lifting heavy loads, occupations in extreme postures of full flexion or oscillation of the whole body when seated, and which compel the cessation of all activities which are or could be the cause for the origin, exacerbation or recurrence of the disease. These occupational diseases came into force at the start of 1993, but there have been considerable problems in their implementation. The present Part I of the contribution is the result of the work of an interdisciplinary study group and contains medical criteria for the assessment of possibly strain-related clinical characteristics and the evaluation of other possible causes. Part II is to be published in Volume 4/2005 and will deal with questions related to forced cessation and to the assessment of the loss of earning ability. Agreement was reached in many areas related to the assessment of occupational claims. This should allow for evidence-based decision making in the future for the occupational diseases Nos. 2108 and 2110. 相似文献
10.