Implications of upper respiratory tract infections and drugs in the clinical spectrum of Henoch-Schönlein purpura in children

1. Gonzalez-Gay, M.A.
2. Calviño, M.C.
3. Vazquez-Lopez, M.E.
4. Garcia-Porrua, C.
5. Fernandez-Iglesias, J.L.
6. Dierssen, T.
7. Llorca, J.