<?xml version="1.0" encoding="utf-8"?><mads xmlns="http://www.loc.gov/mads/" xmlns:mods="http://www.loc.gov/mods/v3" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.loc.gov/mads/
mads.xsd"><authority><topic authority="http://medical-terms.tematres.dev.ekt.gr/vocab">heart valves</topic></authority><related type="narrower"><topic>aortic valve</topic></related><related type="narrower"><topic>pulmonary valve</topic></related><related type="other"><topic>heart valve prolapse</topic></related><related type="broader"><topic>heart</topic></related></mads>