Although claims data provide the most accurate information about health care use, ensuring adequate follow-up for purposes of obtaining information from patient self-report is important because many people do not report alcohol-related events to insurance compa-nies.
( ( Although ( ( claims data ) ( provide ( ( the ( ( most accurate ) information ) ) ( about ( health ( care use ) ) ) ) ) ) ) ( , ( ( ( ensuring ( adequate follow-up ) ) ( for ( purposes ( of ( ( obtaining information ) ( from ( patient self-report ) ) ) ) ) ) ) ( ( ( is important ) ( because ( ( many people ) ( ( do not ) ( ( report ( alcohol-related events ) ) ( to ( insurance compa-nies ) ) ) ) ) ) ) . ) ) ) )
(ROOT (S (SBAR (IN Although) (S (NP (NNS claims) (NNS data)) (VP (VBP provide) (NP (NP (DT the) (ADJP (RBS most) (JJ accurate)) (NN information)) (PP (IN about) (NP (NN health) (NN care) (NN use))))))) (, ,) (S (VP (VBG ensuring) (NP (JJ adequate) (NN follow-up)) (PP (IN for) (NP (NP (NNS purposes)) (PP (IN of) (S (VP (VBG obtaining) (NP (NN information)) (PP (IN from) (NP (JJ patient) (NN self-report)))))))))) (VP (VBZ is) (ADJP (JJ important)) (SBAR (IN because) (S (NP (JJ many) (NNS people)) (VP (VBP do) (RB not) (VP (VB report) (NP (JJ alcohol-related) (NNS events)) (PP (TO to) (NP (NN insurance) (NNS compa-nies)))))))) (. .)))
Patients naturally always report to insurance companies when health problems may be a direct result of alcohol. 
( Patients ( naturally ( ( always ( ( report ( to ( insurance companies ) ) ) ( when ( ( health problems ) ( may ( be ( ( a ( direct result ) ) ( of alcohol ) ) ) ) ) ) ) ) . ) ) )
(ROOT (S (NP (NNS Patients)) (ADVP (RB naturally)) (VP (ADVP (RB always)) (VB report) (PP (TO to) (NP (NN insurance) (NNS companies))) (SBAR (WHADVP (WRB when)) (S (NP (NN health) (NNS problems)) (VP (MD may) (VP (VB be) (NP (NP (DT a) (JJ direct) (NN result)) (PP (IN of) (NP (NN alcohol))))))))) (. .)))