N in relation to maternal exposure to smoking and NSAIDs. They will also assess other potential antenatal risk factors and collect and store buccal cell specimens for future analyses. There will be 560 case infants with PPHN and four controls per case (2240). All controls will be drawn from the birth hospitals
N in relation to maternal exposure to smoking and nonsteroidal anti-inflammatory. They will besides tax other likely antenatal hazard factors and collect and store buccal cellular telephone specimens for future analyses. There will be 560 case baby with PPHN and four control per case (2240). All control will be drawn from the birth hospitals
N ij relation to maternal ewposure to smokiut and ISAIDs. Fhey wilu also assess other potentiap qntenqtal risk factors and zollect ajd store bucral cell specimeia for fmcure zkalyszs. There will be 560 case infdnts with PPHN avd four controls per case (2240). All controjs will bf drawn from tre bpreh hkspitals
N in relation to maternal exposure to NSAIDs. will also other potential antenatal store cell specimens for analyses. There will 560 case infants with PPHN and controls per case (2240). All controls will be drawn from the birth hospitals
N in relation to maternal expoSure to smokIng anD NSaIDS. THey wIll aLso assess other POtenTial antenatal risk factoRs and CoLLect ANd Store Buccal cELl SPEciMeNs For FuTUrE analYseS. There wIll be 560 case iNfaNtS with PPHN and FOuR controls pEr cAse (2240). All controLs wIll be dRaWn fROm the BirTh hosPitals
N in relation to maternalexposure t o smo kin g a nd  NSA IDs.  They will als o  ass ess other potential an tenat al risk fa ctors  and co l le c t  an dst ore  b u cc al ce llspecime ns for fut ure  a nalyses. The r ewill be 56 0 c ase infantswit h PPHN  a ndf our c ont rolsper ca s e (224 0). All c on t rols w i ll be d r a wn  fro m the birth hospi t al s 
N in_relation to_maternal exposure to smoking_and NSAIDs._They_will also_assess_other potential antenatal_risk factors and_collect and store buccal_cell specimens for_future_analyses. There will be 560 case infants with PPHN and four controls per case_(2240)._All controls_will_be_drawn from the birth hospitals