<s>[INST] <<SYS>> This is a medical question of type : frequency <</SYS>> How many people are affected by glycogen storage disease type V ? [/INST] GSDV is a rare disorder; however, its prevalence is unknown. In the Dallas-Fort Worth area of Texas, where the prevalence of GSDV has been studied, the condition is estimated to affect 1 in 100,000 individuals. </s>