$Vocera通信(VCRA)$ 8-K - Current report Filed: 2018-05-17 AccNo: 0001628280-18-006911 Size: 1 MBItem 1.01: Entry into a Material Definitive AgreementItem 2.03: Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a RegistrantItem 3.02: Unregistere 网页链接