PT - JOURNAL ARTICLE AU - Michael S. Niederman TI - Natural enemy or friend? Pneumonia in the very elderly critically ill patient AID - 10.1183/16000617.0031-2020 DP - 2020 Mar 31 TA - European Respiratory Review PG - 200031 VI - 29 IP - 155 4099 - http://err.ersjournals.com/content/29/155/200031.short 4100 - http://err.ersjournals.com/content/29/155/200031.full SO - EUROPEAN RESPIRATORY REVIEW2020 Mar 31; 29