Thermographic feet images of uninjured participant (A) and NFCI patient (B) to cold air (10°C). Thermal scale on left side of picture: white/pale blue = coldest and red = warmest. Top right image: on initial exposure to cold air. Top left image: after 5 min of exposure and just prior to forced convective stimulus. Bottom left image: at the end of a 5-min forced convective stimulus. Bottom right image: at the end of a further 5 min of exposure to still air.