目的 系统评价Omega-3脂肪酸用于肿瘤恶液质患者口服营养补充（ONS） 的临床疗效。方法全面检索PubMed 、EMbase、Web of Science、中国知网、万方数据库和SinoMed等数据库，搜索关于含Omega-3脂肪酸营养补充治疗肿瘤恶液质患者的随机对照试验。检索时间为2000年1月1日至2020年７月４日。对符合纳人标准的研究进行质量评价，按照 Cochmne5.1手册标准及改良的Jadad评分量表对纳人的研究进行偏倚风险评估和文献质量评价，最后应用RevMan5.3软件进行数据合并及meta分析。结果 初筛获得316篇文献，通过阅读标题和摘要进一步筛选获得54篇文献...

Objective: To determine the relative effectiveness of dietary macronutrient patterns and popular named diet programmes for weight loss and cardiovascular risk factor improvement among adults who are overweight or obese. Design: Systematic review and network meta-analysis of randomised trials. ...

Background. Little is known about the health risks of air pollution and cardiorespiratory diseases, globally, across regions and populations, which may differ because of external factors. Objectives. We systematically reviewed the evidence on the association between air pollution and cardiorespi...

Background: Nitrogen dioxide (NO 2 ) is a pervasive urban pollutant originating primarily from vehicle emissions. Ischemic heart disease (IHD) is associated with a considerable public health burden worldwide, but whether NO2 exposure is causally related to IHD morbidity remains in question. Our o...

The association between the particulate matters with aerodynamic diameter 2.5 (PM2.5 ) and daily respiratory deaths, particularly the concentration-response pattern, has not been fully examined and established in China. We conducted a systematic review of time-series studies to compile informatio...

Background: We conducted this systematic review and meta-analysis to address the crucial public health issue of the suspected association between air pollution exposure during pregnancy and the risk of infant mortality. Methods: We searched on MEDLINE ® databases among articles published until ...

Air pollutant levels in many Chinese cities remained significantly higher than the upper limits stated in World Health Organization guidelines. In light of limited evidence in China, we conducted a meta-analysis summarizing the association between acute exposure of air pollution and cardiovasc...

Background and Purpose—Epidemiological studies suggest an association between stroke incidence and stroke mortality and long-term exposure to particulate matter (PM) air pollution. However, the magnitude of the association is still unclear. Methods—We searched the Pubmed citation database for e...

Background: Individual studies on the relations between ambient air pollution and the risk of stillbirth have provided contradictory results. We conducted a systematic review and meta-analysis to summarise the existing evidence. Methods: We conducted a systematic search of three databases: PubMed...

Background: Chronic exposure to ambient particulate matter (PM) has been suggested to be associated with an increased risk of lung cancer, but the results were inconsistent. We performed a systematic review and meta-analysis of prospective studies to assess the association between exposure to PM ...