SLC52A3 and hyperinsulinemic hypoglycemia, familial, 4: Respiratory problems were reported in 21/37 (57 %) patients with RFTV2 deficiency and in 25/33 (76 %) patients with RFVT3 deficiency (Green et al. 2010; Johnson et al. 2010; Bosch et al. 2011; Anand et al. 2012; Koy et al. 2012; Dezfouli et al. 2012; Johnson et al. 2012; Ciccolella et al. 2012; Ciccolella et al. 2013; Foley et al. 2014; Spagnoli et al. 2014; Cosgrove et al. 2015; Davis et al. 2015; Horoz et al. 2015).