A preliminary multipoint genome scan using mean IBD tests (figures not shown here) indicated some evidence of linkage to ALDX1 in the regions around 145 cM of chromosome 7 (p-value of 0.006), 161 cM of chromosome 6 (p-value of 0.008), and 157 cM of chromosome 12 (p-value of 0.016). Evidence of linkage to ALDX2 was found in the regions around 128 cM of chromosome 7 (p-value of 0.0086), 14 cM of chromosome 8 (p-value of 0.0196), 169 cM of chromosome 6 (p-value of 0.021), 5 cM of chromosome 2 (p-value of 0.041), and 148 cM of chromosome 2 (p-value of 0.049).