<?xml version="1.0" encoding="utf-8"?><!DOCTYPE Zthes SYSTEM "http://zthes.z3950.org/xml/zthes-05.dtd">  <Zthes><term><termId>18784</termId><termName>cardiovascular diseases</termName><termType>PT</termType><termCreatedDate>0000-00-00 00:00:00</termCreatedDate><relation><relationType>BT</relationType><termId>18438</termId><termName>diseases</termName><termType>PT</termType></relation><relation><relationType>NT</relationType><termId>18941</termId><termName>heart diseases</termName><termType>PT</termType></relation><relation><relationType>NT</relationType><termId>18974</termId><termName>vascular diseases</termName><termType>PT</termType></relation></term>  </Zthes>