Change in TBFVL patterns at six months follow-up: We could follow 14 children six months after diagnosis as IPFT services were closed due to the COVID pandemic. The TBFVL patterns after six months in these 14 children are shown in Table 5. At baseline, pattern 3 was most common, followed by pattern 4. At six months of follow-up, pattern 1 (normal) was most common, followed by patterns 3 and 4. However, there was no significant difference in the pattern of IPFT in follow-up overall; it may be because of a small number of children.