2641979 ELDH extraforaminal lumbar disc herniation 5 2641975 ELDH elevated LDH 2 2641981 ELDH early low-dose hydrocortisone 1 2641977 ELDH exfoliated layered double hydroxide 1 2641980 ELDH Extracanalicular lumbar disc herniation 1 2641978 ELDH extreme lateral disc herniation 1