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===Microscopic=== | ===Microscopic=== | ||
*Like chronic pulmonary hypertension due to congenital heart disease but ''without'' the congenital heart disease.<ref name=dccpad/> | *Like chronic pulmonary hypertension due to [[congenital heart disease]] but ''without'' the congenital heart disease.<ref name=dccpad/> | ||
**Classified by ''Heath-Edwards classification'' (see below) into six grades. | **Classified by ''Heath-Edwards classification'' (see below) into six grades. | ||
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