Reference	Objective	Design	Evidence
Adams et al. [439]	To assess role of lipid laden macrophages in diagnosis	PCS	3B+
Chen et al. [440]	Study of pneumonia in patients with dementia	RCS	2B+
DeToledo et al. [441]	To assess AP frequency after epileptic fits	RCS	4A+
El Solh et al. [6]	BAL study of microbiology of nursing home patients	PCS	4A+
Kadowaki et al. [442]	Antibiotic trial	RCT	2B+
Leroy et al. [44]	Study of ICU admissions	RCS	4B+
Mier et al. [443]	PSB study of ICU admissions	PCS	3B+
Mylotte et al. [444]	To compare features of aspiration pneumonia (AP) with aspiration pneumonitis	RCS	4A+
Reza et al. [445]	To compare features of AP in patients from long‐term care facilities and the community	RCS	4A+
Teramoto et al. [446]	To identify frequency of aspiration pneumonia in hospitalized adults with CAP	PCS	3B?