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SDHB p.R90X mutation-associated PPGL have considerable phenotypic variability and therefore are associated with a higher risk of remote metastasis and death.SDHB p.R90X mutation-associated PPGL have significant phenotypic variability and are usually involving a higher chance of distant metastasis and death. ) and percentage of total rest time with saturation 90% (T9 were determined. RVD was identified into the existence of required expiratory volume i