1. Jennette, JC, Falk, RJ, Bacon, PA. 2012 revised International Chapel Hill Consensus conference nomenclature of vasculitides. Arthritis Rheum 2013; 65: 1–11.
Google Scholar | Crossref | Medline2. Piram, M, Mahr, A. Epidemiology of immunoglobulin A vasculitis (Henoch-Schönlein): current state of knowledge. Curr Opin Rheumatol 2013; 25: 171–178.
Google Scholar | Crossref | Medline | ISI3. Vogler, C, Eliason, SC, Wood, EG. Glomerular membranopathy in children with IgA nephropathy and Henoch Schönlein purpura. Pediatr Dev Pathol 1999; 2: 227–235.
Google Scholar | SAGE Journals | ISI4. Altugan, FS, Ozen, S, Aktay-Ayaz, N, et al. Treatment of severe Henoch-Schönlein nephritis: justifying more immunosuppression. Turk J Pediatr 2009; 51: 551–555.
Google Scholar | Medline5. Bogdanovic, R . Henoch-Schonlein purpura nephritis in children: risk factors, prevention and treatment. Acta Paediatr 2009; 98: 1882–1889.
Google Scholar | Crossref | Medline6. Ozen, S, Marks, SD, Brogan, P, et al. European consensus-based recommendations for diagnosis and treatment of immunoglobulin A vasculitis-the SHARE initiative. Rheumatology 2019; 58: 1607–1616.
Google Scholar | Crossref | Medline7. Shahin, AA, Zayed, HS, Elrefai, RM, et al. The distribution and outcome of vasculitic syndromes among Egyptians: a multi-center study including 630 patients. Egypt Rheumatol 2018; 40: 243–248.
Google Scholar | Crossref8. Leclercq, E, Leeflang, MM, van Dalen, EC, et al. Validation of search filters for identifying pediatric studies. J Pediatr 2013; 162: 629–634.
Google Scholar | Crossref | Medline9. OCEBM Levels of Evidence Working Group . The Oxford levels of evidence 2. Oxford: Oxford Centre for Evidence-Based Medicine, 2011.
Google Scholar10. Hsu, CC, Sandford, BA. The Delphi technique: making sense of consensus. Pract Assess Res Eval 2007; 12: 1–8.
Google Scholar11. Diamond, IR, Grant, RC, Feldman, BM, et al. Defining consensus: a systematic review recommends methodologic criteria for reporting of Delphi studies. J Clin Epidemiol 2014; 67: 401–409.
Google Scholar | Crossref | Medline | ISI12. Von der Gracht, H . Consensus measurement in Delphi studies: review and implications for future quality assurance. Technol Forecast Soc 2012; 79: 1525–1536.
Google Scholar | Crossref | ISI13. Hansen, MP, Bjerrum, L, Gahrn-Hansen, B, et al. Quality indicators for diagnosis and treatment of respiratory tract infections in general practice: a modified Delphi study. Scand J Prim Health Care 2010; 28: 4–11.
Google Scholar | Crossref | Medline14. Lai, L, Flower, A, Moore, M, et al. Developing clinical practice guidelines for Chinese herbal treatment of polycystic ovary syndrome: a mixed-methods modified Delphi study complement. Ther Med 2015; 23: 430–438.
Google Scholar | Medline15. Gardner-Medwin, JM, Dolezalova, P, Cummins, C, et al. Incidence of Henoch-Schönlein purpura, Kawasaki disease, and rare vasculitides in children of different ethnic origins. Lancet 2002; 360: 1197–1202.
Google Scholar | Crossref | Medline | ISI16. Egypt Demographics Profile , 2020, https://www.indexmundi.com/egypt/demographics_profile.html
Google Scholar17. González-Gay, MA, López-Mejías, R, Pina, T, et al. IgA vasculitis: genetics and clinical and therapeutic management. Curr Rheumatol Rep 2018; 20: 24.
Google Scholar | Crossref | Medline18. González-Gay, MA, Blanco, R, Castañeda, S. Henoch-Schönlein purpura (IgA vasculitis): the paradox of the different incidence and clinical spectrum in children and adults. Clin Exp Rheumatol 2017; 35(Suppl. 103): 3–4.
Google Scholar | Medline19. Prieto-Peña, D, Remuzgo-Martínez, S, Genre, F, et al. Role of the IL33 and IL1RL1 pathway in the pathogenesis of immunoglobulin A vasculitis. Sci Rep 2021; 11: 16163.
Google Scholar | Crossref | Medline20. Prieto-Peña, D, Genre, F, Remuzgo-Martínez, S, et al. BAFF, APRIL and BAFFR on the pathogenesis of immunoglobulin-A vasculitis. Sci Rep 2021; 11: 11510.
Google Scholar | Crossref | Medline21. Mills, JA, Michel, BA, Bloch, DA, et al. The American College of Rheumatology 1990 criteria for the classification of Henoch-Schönlein purpura. Arthritis Rheum 1990; 33: 1114–1121.
Google Scholar | Crossref | Medline22. Schoemaker, CG, Swart, JF, Wulffraat, NM. Treating juvenile idiopathic arthritis to target: what is the optimal target definition to reach all goals? Pediatr Rheumatol 2020; 18: 34.
Google Scholar | Crossref | Medline23. KDIGO . Chapter 11: Henoch-Schonlein purpura nephritis. Kidney Int Suppl 2012; 2: 218–220, https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4089717/pdf/kisup201224a.pdf
Google Scholar | Crossref24. Du, Y, Hou, L, Zhao, C, et al. Treatment of children with Henoch-Schonlein purpura nephritis with mycophenolate mofetil. Pediatr Nephrol 2012; 27: 765–771.
Google Scholar | Crossref | Medline | ISI25. Hackl, A, Becker, JU, KÖrner, LM, et al. Mycophenolate mofetil following glucocorticoid treatment in Henoch-Schönlein purpura nephritis: the role of early initiation and therapeutic drug monitoring. Pediatr Nephrol 2018; 33: 619–629.
Google Scholar | Crossref | Medline26. Jauhola, O, Ronkainen, J, Autio-Harmainen, H, et al. Cyclosporine A vs. Methylprednisolone for Henoch-Schönlein nephritis: a randomized trial. Pediatr Nephrol 2011; 26: 2159–2166.
Google Scholar | Crossref | Medline27. Rowe, G, Wright, G. The Delphi technique as a forecasting tool: issues and analysis. Int J Forecast 1999; 15: 353–375.
Google Scholar | Crossref | ISI28. Jones, J, Hunter, D. Consensus methods for medical and health services research. BMJ 1995; 311: 376–380.
Google Scholar | Crossref | Medline29. Rayens, MK, Hahn, EJ. Building consensus using the policy Delphi method. Policy Polit Nurs Pract 2000; 1: 308–315.
Google Scholar | SAGE Journals30. Byun, JW, Song, HJ, Kim, L, et al. Predictive factors of relapse in adult with Henoch–Schönlein purpura. Am J Dermatopathol 2012; 34: 139–144.
Google Scholar | Crossref | Medline31. Prais, D, Amir, J, Nussinovitch, M. Recurrent Henoch–Schönlein purpura in children. J Clin Rheumatol 2007; 13: 25–28.
Google Scholar | Crossref | Medline32. Calvo-Río, V, Hernández, JL, Ortiz-Sanjuán, F, et al. Relapses in patients with Henoch-Schönlein purpura: analysis of 417 patients from a single center. Medicine 2016; 95: e4217.
Google Scholar | Crossref | Medline