00303nas a2200097   4500000000100000008004100001100001200042700001400054245012300068022001400191       2020                            d1 aT. Tran1 aS. Suissa00aComparing New-User Cohort Designs: The Example of Proton Pump Inhibitor Effectiveness in Idiopathic Pulmonary Fibrosis  a0002-9262