Standard screens may not perform as well in these patient subgroups that may represent a considerable part of the ED population.
( ( Standard screens ) ( ( ( may not ) ( ( perform ( as well ) ) ( in ( ( these ( patient subgroups ) ) ( that ( may ( represent ( ( a ( considerable part ) ) ( of ( the ( ED population ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Standard) (NNS screens)) (VP (MD may) (RB not) (VP (VB perform) (ADVP (RB as) (RB well)) (PP (IN in) (NP (NP (DT these) (JJ patient) (NNS subgroups)) (SBAR (WHNP (WDT that)) (S (VP (MD may) (VP (VB represent) (NP (NP (DT a) (JJ considerable) (NN part)) (PP (IN of) (NP (DT the) (NNP ED) (NN population)))))))))))) (. .)))
These patient groups are highly specific.
( ( These ( patient groups ) ) ( ( are ( highly specific ) ) . ) )
(ROOT (S (NP (DT These) (JJ patient) (NNS groups)) (VP (VBP are) (ADJP (RB highly) (JJ specific))) (. .)))