https://pubmed.ncbi.nlm.nih.gov/?term=caval%20filter%20AND%20Randomized%20Controlled%20Trial%5Bptyp%5D&cmd=DetailsSearch
caval filter AND Randomized Controlled Trial[ptyp] - Search Results - PubMed
caval filter AND Randomized Controlled Trial[ptyp] - Search Results - PubMed
randomized controlled trialsearch resultscavalfilterpubmed
https://www.upo.es/investiga/ptyp/en/home/
PTyP