preferred_name: Electro-oculogram (EOG), flash electroretinogram (ERG) and pattern ERG (PERG) initially normal
preferred_name_lc: electro-oculogram (eog), flash electroretinogram (erg) and pattern erg (perg) initially normal
label: Electro-oculogram (EOG), flash electroretinogram (ERG) and pattern ERG (PERG) initially normal
label_lc: electro-oculogram (eog), flash electroretinogram (erg) and pattern erg (perg) initially normal