This meta-analysis aimed to compare the clinical symptoms of COVID-19 pneumonia in children. Electronic databases including PubMed, EMBASE, Web of Science, China National Knowledge Infrastructure (CNKI) database, Wanfang Database, and Chinese Biomedical Literature Database (CBM) were searched from its inception to June 21, 2020. We only included studies that reported clinical symptoms of COVID pneumonia in children. Quality of the included studies was assessed by 2 authors. Pooled results were summarized by STATA 12.0 software.The heterogeneity was measured by I2 tests (I2 < 50 indicates little heterogeneity, I2≥50 indicates high heterogeneity). Publication bias was performed by funnel plot and statistically assessed by Begg test (P > .05 as no publication bias). Results will be shown as figures or tables. Our study aims to systematically present the clinical symptoms of COVID-19 pneumonia patients in children, so as to further provide guidance for clinical management. Our study aims to systematically present the clinical symptoms of COVID-19 pneumonia patients in children, so as to further provide guidance for clinical management. Knee osteoarthritis (KOA) is a common disabling condition and a heavy financial burden to the society. Platelet-rich plasma (PRP) is considered to be an effective method in the repair and regeneration of cartilage and alleviate pain in KOA. But the utilising of PRP to treat KOA in clinical has shown variable results from many studies. The objective of this protocol is to determine the efficacy of PRP in pain control and cartilage repair in KOA animal models. We will search the following three electronic databases MEDLINE, EMBASE and Web of Science. The primary outcome will include the histological score of cartilage and pain score. https://www.selleckchem.com/products/gsk650394.html The secondary outcomes will be the behavioural assessments and cartilage thickness. SYRCLE's risk of bias tool will be used to assessment the risk of bias of including studies. The standardized mean difference and 95% confidence interval will be used to calculate the effect of PRP treatment. The I2 inconsistency values will be used to calculated the heterogeneity between studies. The results of this paper will be submitted to a peer-reviewed journal for publication. This research will determine the efficacy of PRP of the treatment of knee osteoarthritis model. CRD42020181589. CRD42020181589. We aim to study the treatment of vitiligo with fire needle. We will search PubMed, Embase, the Cochrane Library, the China National Knowledge Infrastructure, Chinese Science and Technology Periodical Database, Wanfang Database, and Chinese Biomedical Literature Database of randomized controlled trials beginning from their inception to August 2020. The primary outcomes is that Complex area of white spot and Percentage of Clinical Effectiveness will be accepted as the primary outcomes. Additional outcome is the safety assessment will be considered a secondary outcome. Two independent authors will based on the Cochrane system evaluation manual 5.1.0 version of randomized controlled trial bias risk assessment tool to evaluate the risk of bias among the final included studies. And we will use the RevMan 5.3 software to analysis data. This study will provide evidence to judge whether fire needle is an effective therapy for vitiligo. INPLASY2020120012. INPLASY2020120012. To evaluate dapagliflozin, canagliflozin, empagliflozin, ertugliflozin, and sotagliflozin according to their effect on the glycated hemoglobin A1c (HbA1c) level in patients with type 2 diabetes mellitus. The Web of Science, PubMed, Cochrane Library, EMBASE, and Clinical Trials databases were electronically searched to collect randomized controlled trials of patients with type 2 diabetes mellitus through June 2020. Two researchers independently screened and evaluated the obtained studies and extracted the outcome indexes. RevMan 5.3 software was used to perform the meta-analysis and to create plots. Finally, 27 studies were selected and included in this study. The meta-analysis results showed that sodium-dependent glucose transporter (SGLT) inhibitors significantly reduced the HbA1c level in patients with type 2 diabetes mellitus. However, these results were highly heterogeneous, so we conducted a subgroup analysis. The results of the subgroup analysis suggested that by dividing populations into different subgroups, the heterogeneity of each group could be reduced. SGLT inhibitors had a good effect on the HbA1c level in patients with type 2 diabetes mellitus, but there might be differences in the efficacy of SGLT inhibitors in different populations. It is hoped that more studies will be conducted to evaluate the efficacy and safety of SGLT inhibitors in different populations. CRD42020185025. CRD42020185025. Henoch-Schönlein Purpura (HSP) is an acute small vessel vasculitis. It is the most common vasculitis in children. In majority of the cases, the disease is self-limited. Relapses can occur, in particular during the first year of the disease. There is no consensus on a specific treatment. The efficacy and safety of steroidal treatment in treating HSP is still controversial. Immunosuppressive treatment of HSP nephritis is used in patients with severe renal involvement (nephrotic range proteinuria and/or progressive renal impairment). The literature on immunosuppressive treatment of severe HSP without kidney involvement is scanty. We report 2 case reports of 2 adolescents affected from Henoch-Schönlein Purpura and severe gastrointestinal involvement. Both patients presented a poor response to steroids treatment. The diagnosis of HSP was made according to the diagnostic criteria published by European League against Rheumatism and Pediatric Rheumatology European Society in 2006. In consideration of the recurrence of the Henoch Schönlein Purpura and the gastrointestinal involvement, we decided to start Mycophenolate Mofetil treatment. In both patients all clinical manifestations resolved in few days. In our cases of HSP with gastrointestinal involvement Mycophenolate Mofetil treatment has been very effective. This experience teaches us that immunosuppressive agents may be very useful to induce and maintain remission not only in renal involvement, but in all cases of persistent, recurrent, or complicated Henoch Schönlein Purpura in children. In our cases of HSP with gastrointestinal involvement Mycophenolate Mofetil treatment has been very effective. This experience teaches us that immunosuppressive agents may be very useful to induce and maintain remission not only in renal involvement, but in all cases of persistent, recurrent, or complicated Henoch Schönlein Purpura in children.