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. 2020 Jun 5;20:160. doi: 10.1186/s12890-020-01198-4

Fig. 1.

Fig. 1

Flowchart of study enrollment. Four hundred thirty-three patients were excluded from analysis because of aspiration risks (n = 416), a protocol violation by a physician (n = 13), and the use of immunosuppressive drugs (n = 4). CTRX = ceftriaxone; ABPC/SBT = ampicillin/sulbactam; MITT = modified intention-to-treatment; VPP = validated per protocol