PT  - JOURNAL ARTICLE
AU  - Samy Suissa
AU  - Pierre Ernst
TI  - Avoiding immortal time bias in observational studies
AID  - 10.1183/13993003.00138-2020
DP  - 2020 Mar 01
TA  - European Respiratory Journal
PG  - 2000138
VI  - 55
IP  - 3
4099  - http://erj.ersjournals.com/content/55/3/2000138.short
4100  - http://erj.ersjournals.com/content/55/3/2000138.full
SO  - Eur Respir J2020 Mar 01; 55