[word=especially] [lemma=those] [tag=IN] [lemma=□]
[word=especially] [lemma=those] [tag=IN] [lemma=comparable]
[word=especially] [lemma=those] [tag=IN] [lemma=those]
Study of relatively low risk populations , especially those with comparable levels of subclinical disease , may provide clues to prevention of disease in other ethnic groups .