( ( In addition ) ( , ( ( patient selection ) ( ( is ( an ( important factor ) ) ) . ) ) ) )
(ROOT (S (PP (IN In) (NP (NN addition))) (, ,) (NP (NN patient) (NN selection)) (VP (VBZ is) (NP (DT an) (JJ important) (NN factor))) (. .)))
In addition, patient selection is an important factor.
(ROOT (S (NP (NNP Community) (NNS interactions)) (VP (VBP are) (NP (NP (JJ important) (NNS factors)) (PP (IN in) (NP (JJ natural) (NN selection))))) (. .)))