全文获取类型
收费全文 | 3445936篇 |
免费 | 297403篇 |
国内免费 | 13845篇 |
专业分类
耳鼻咽喉 | 47310篇 |
儿科学 | 108879篇 |
妇产科学 | 87644篇 |
基础医学 | 549255篇 |
口腔科学 | 93016篇 |
临床医学 | 312138篇 |
内科学 | 611219篇 |
皮肤病学 | 89292篇 |
神经病学 | 297152篇 |
特种医学 | 137944篇 |
外国民族医学 | 299篇 |
外科学 | 533570篇 |
综合类 | 105980篇 |
现状与发展 | 24篇 |
一般理论 | 2265篇 |
预防医学 | 293314篇 |
眼科学 | 78662篇 |
药学 | 237344篇 |
24篇 | |
中国医学 | 9547篇 |
肿瘤学 | 162306篇 |
出版年
2021年 | 55047篇 |
2020年 | 35047篇 |
2019年 | 58045篇 |
2018年 | 71265篇 |
2017年 | 54236篇 |
2016年 | 59920篇 |
2015年 | 74060篇 |
2014年 | 108352篇 |
2013年 | 173362篇 |
2012年 | 91964篇 |
2011年 | 91813篇 |
2010年 | 116461篇 |
2009年 | 120943篇 |
2008年 | 78938篇 |
2007年 | 82099篇 |
2006年 | 92733篇 |
2005年 | 88269篇 |
2004年 | 90271篇 |
2003年 | 81212篇 |
2002年 | 70343篇 |
2001年 | 110968篇 |
2000年 | 104564篇 |
1999年 | 102148篇 |
1998年 | 66152篇 |
1997年 | 63775篇 |
1996年 | 61978篇 |
1995年 | 57729篇 |
1994年 | 51743篇 |
1993年 | 48346篇 |
1992年 | 73460篇 |
1991年 | 70182篇 |
1990年 | 66511篇 |
1989年 | 65083篇 |
1988年 | 60351篇 |
1987年 | 59018篇 |
1986年 | 55841篇 |
1985年 | 55948篇 |
1984年 | 50402篇 |
1983年 | 45744篇 |
1982年 | 42536篇 |
1981年 | 39962篇 |
1980年 | 37664篇 |
1979年 | 41754篇 |
1978年 | 36553篇 |
1977年 | 33110篇 |
1976年 | 30448篇 |
1975年 | 29025篇 |
1974年 | 30260篇 |
1973年 | 29025篇 |
1972年 | 27026篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
931.
Phantana-angkool April Voci Amy E. Warren Yancey E. Livasy Chad A. Beasley Lakesha M. Robinson Myra M. Hadzikadic-Gusic Lejla Sarantou Terry Forster Meghan R. Sarma Deba White Richard L. 《Annals of surgical oncology》2019,26(12):3874-3882
Annals of Surgical Oncology - The role of sentinel lymph node biopsy (SLNB) when ductal carcinoma in situ with microinvasion (DCISM) is identified on core biopsy is unclear. Our aim was to assess... 相似文献
932.
Ming-Yeh Yang Ching-Yuan Huang Tina H.T. Chiu Kai-Chih Chang Ming-Nan Lin Liang-Yü Chen Anren Hu 《Yao wu shi pin fen xi = Journal of food and drug analysis.》2019,27(2):494-501
Vitamin D is responsible for multiple metabolic functions in humans. Rickets are the most common disease caused by vitamin D deficiency. It is caused by poor calcium intake resulting in poor serum-ionized calcium. The purpose of this study is to develop a rapid, sensitive, and feasible method to determine the 25-hydroxy-vitamin D3 (25(OH)D3) levels in blood samples for clinical assessment. In this study, gas chromatography coupled mass spectrometry with trimethylsilyl derivatization (TMS-GC-MS) is the most suitable protocol for quantitative analyses of 25(OH)D3. Performance of method was evaluated and compared with liquid chromatography and immunoassay. Method validation has been carried out with plasma specimens. The limit of quantitation of TMS-GC-MS method is 1.5 ppb with good linear correlation. Furthermore, the dietary intake and nutritional status of vegetarian and non-vegetarians in Taiwan were assessed by our validated method. As a result, this vitamin D nutrition survey demonstrates that most Taiwanese people have insufficient vitamin D. Due to dietary habits; the male vegans may have the highest risk of vitamin D deficiency. 相似文献
933.
Christopher N. Cooley Tyler J. Beranek Matthew A. Warpinski Robert Alexander Amanda O. Esquivel 《The American journal of emergency medicine》2019,37(2):199-203
Introduction
In the United States there has been a large increase in participation in lacrosse for both males and females. The purpose of this study was to analyze the number of head injuries, injury rates (calculated using the reported number of participants) and types of head injuries that are seen in emergency departments in the United States.Methods
We compared injuries between male and female lacrosse participants. This was a retrospective study using a publicly available database produced by the US Consumer Product Safety Commission and information about lacrosse participation from US Lacrosse.Results
A linear regression was performed and showed a positive correlation between number of head injuries to males and time from 2002 to 2010 (R2?=?0.823; p?=?0.001). While the number of injuries to the head in female lacrosse participants was not significant. There was a negative correlation between the number of head injuries to males from 2010 to 2016 (R2?=?0.800; p?=?0.007), but again, there was no significance for female injury count (R2?=?0.417; p?=?0.117). Other significant differences between head injuries in males and females included the mechanism of injury and the type of injury recorded.Conclusion
The most recent data from 2010 to 2016, suggest that both males and females have had a decrease in injury rate. However the total number of female head injuries is not significantly decreasing and as the sport continues to grow there will likely be more total head injuries and visits to the emergency department. 相似文献934.
935.
M. Masson Regnault J. Castañeda-Sanabria M.H.T. Diep Tran M. Beylot-Barry H. Bachelez N. Beneton O. Chosidow A. Dupuy P. Joly D. Jullien E. Mahé M.-A. Richard M. Viguier F. Tubach E. Sbidian C. Paul The PsoBioTeq Study Group 《Journal of the European Academy of Dermatology and Venereology》2020,34(2):293-300
936.
937.
Martina A. Steurer Jean Costello Rebecca J. Baer Scott P. Oltman Sky K. Feuer Tania Pacheco-Werner Elizabeth Rogers Marta M. Jankowska Jessica Block Molly McCarthy Matthew S. Pantell Christina Chambers Kelli K. Ryckman Laura L. Jelliffe-Pawlowski 《Paediatric and perinatal epidemiology》2020,34(2):130-138
938.
Amy Y. Zhang Christopher Burant Alex Z. Fu Gerald Strauss Donald R. Bodner Lee Ponsky 《Journal of psychosocial oncology》2020,38(2):210-227
AbstractPurpose: We examined underlying psychosocial processes of a behavioral treatment for urinary incontinence (UI) of prostate cancer survivors.Design: Secondary analysis of data collected from a clinical trial.Sample: Two hundred forty-four prostate cancer survivors who participated in a clinical trial of behavioral intervention to UI as intervention or control subjects.Methods: The participants had a 3-month behavioral intervention or usual care and were followed up for an additional 3?months. They were assessed at baseline, 3, and 6?months. Latent growth curve models were performed to examine trajectories of each study variable and relationships among the variables.Findings: Increasing self-efficacy and social support were significantly and independently associated with more reduction of urinary leakage frequency over time.Implications for psychosocial oncology: Providing problem-solving skills and social support, including peer support, are essential for empowering patients to reduce UI. 相似文献
939.
940.