ABBREVIATIONS
- ACE-I
- angiotensin converting enzyme inhibitor
- C3
- complement component 3
- EULAR
- European league against rheumatism
- Gd-IgA1
- Galactose deficient IgA1 antibodies
- HSP
- Henoch-Schönlein purpura
- HSPN
- Henoch-Schönlein purpura nephritis
- IgA
- immunoglobulin A
- ISKDC
- International Study of Kidney Disease in Children
- KDIGO
- Kidney Disease Improving Global Outcome
- PRES
- paediatric rheumatology european society
- PRINTO
- The paediatric rheumatology international trials organisation