What are the clinical manifestation stages of CRPS?

Stage 1 (after event/without apparent cause pain in limb, burning, throbbig, diffuse uncomfortable aching, sensitivity to touch/cold, localized edema, not compatible with single peripheral nerve symptoms, vasomotor disturbances, norma radiograph but patchy demineralization) Stage 2 (progression of soft tissue edema, thickening of skin and articular soft tissues, muscle wasting, development of brawny skin, lasts for 3-6 months) Stage 3 (most severe, limit ROM, shoulder-hand syndrome, contractures of digits, waxy trophic skin changes, brittle rigid nails, bone radiography reveals severe demineralization)