( Treatments ( ( ( ( last ( ( approximately 16 ) weeks ) ) and ) ( occur weekly ) ) . ) )
(ROOT (S (NP (NNS Treatments)) (VP (VP (VBP last) (NP (QP (RB approximately) (CD 16)) (NNS weeks))) (CC and) (VP (VBP occur) (ADVP (RB weekly)))) (. .)))
Treatments last approximately 16 weeks and occur weekly.
(ROOT (S (NP (DT The) (JJ fetal) (NN period)) (VP (VBZ lasts) (NP (NP (QP (RB approximately) (CD 30)) (NNS weeks)) (NP (NNS weeks)))) (. .)))