NF1 and RASopathy: We estimated that the included studies together included approximately 2601 unique participants with NF1 (82.5% of the total amount of unique RASopathy participants included in our review), 313 with NS (9.9%), 101 with CS (3.2%), 126 with CFC (4%), 4 with Noonan‐like syndrome with loose anagen hair (0.1%) and 6 with NS with multiple lentigines (0.2%).