Your question made me read the article. And it does seem to be lacking enough sample data. At one point she had 550 samples and that was called “substantial” in

Your question made me read the article. And it does seem to be lacking enough sample data. At one point she had 550 samples and that was called “substantial” in the article. Towards the end it had grown to 1000 samples. To your point the study is so small it does not attempt to answer the question in whether veins are static. There appears to be active research in this area in general. It does look like many companies and researchers are looking at ways to use vein patterns for bioinformatics https://biosmart-tech.com/tpost/megjc72d91-palm-vein-scanner-is-the-future-of-biome https://biosmart-tech.com/tpost/megjc72d91-palm-vein-scanner... https://res.mdpi.com/d_attachment/applsci/applsci-10-03192/article_deploy/applsci-10-03192.pdf https://res.mdpi.com/d_attachment/applsci/applsci-10-03192/a...