On the Use of Generalized Additive Models in Time-Series Studies of Air Pollution and Health.
( ( On ( ( the Use ) ( of Generalized ) ) ) ( Additive ( ( Models ( in ( ( Time-Series Studies ) ( of ( Air ( ( Pollution and ) Health ) ) ) ) ) ) . ) ) )
(ROOT (S (PP (IN On) (NP (NP (DT the) (NN Use)) (PP (IN of) (NP (NNP Generalized))))) (NP (NNP Additive)) (VP (VBZ Models) (PP (IN in) (NP (NP (NNP Time-Series) (NNPS Studies)) (PP (IN of) (NP (NNP Air) (NNP Pollution) (CC and) (NNP Health)))))) (. .)))
A series of studies on pollution and it's effects. 
( ( ( A series ) ( of ( studies ( on ( ( pollution and ) it ) ) ) ) ) ( ( 's effects ) . ) )
(ROOT (S (NP (NP (DT A) (NN series)) (PP (IN of) (NP (NP (NNS studies)) (PP (IN on) (NP (NP (NN pollution)) (CC and) (NP (PRP it))))))) (VP (VBZ 's) (NP (NNS effects))) (. .)))