▁INT END ▁( The ▁Children ' s ▁Hospital ▁of ▁Philadelphia ▁Inf ant ▁Test ▁of ▁Ne ur om us cular ▁Dis orders ) ▁in ▁S MA 1 ; ▁and ▁either ▁the ▁Motor ▁Function ▁Me asure ▁scale ▁or ▁one ▁of ▁a ▁few ▁variants ▁of ▁Hamm ers m ith ▁Function al ▁Motor ▁Sc ale ▁in ▁S MA ▁types ▁ 2 ▁and ▁ 3 . ▁ ▁The ▁e pon ym ous ▁label ▁W erd nig – H off mann ▁disease ▁( s ometimes ▁miss pel led ▁with ▁a ▁single ▁n ) ▁refers ▁to ▁the ▁earliest ▁clin ical ▁descri ptions ▁of ▁child hood ▁S MA ▁by ▁Johann ▁Hoff mann ▁and ▁Gu ido ▁W erd nig . ▁The ▁e pon ym ous ▁term ▁K ugel berg – Wel ander ▁disease ▁is ▁after ▁Erik ▁K las ▁Hend rik ▁K ugel berg ▁( 1 9 1 3 – 1 9 8 3 ) ▁and ▁Lisa ▁Wel ander ▁( 1 9 0 9 – 2 0 0 1 ), ▁who ▁distinguished ▁S MA ▁from ▁mus cular ▁d yst ro phy . ▁R are ly ▁used ▁Dub ow itz ▁disease ▁( not ▁to ▁be ▁confused ▁with ▁Dub ow itz ▁synd rome ) ▁is ▁named ▁after ▁Victor ▁Dub ow itz , ▁an ▁English ▁ne uro log ist ▁who ▁author ed ▁several ▁studies ▁on ▁the ▁intermediate ▁S MA ▁phen ot ype . ▁ ▁Sign s ▁and ▁sympt oms ▁ ▁The ▁sympt oms ▁vary ▁depending ▁on ▁the ▁S MA ▁type , ▁the ▁stage ▁of ▁the ▁disease ▁as ▁well ▁as ▁individual ▁factors . ▁Sign s ▁and ▁sympt