Sentence:  Our own studies in which bronchial artery pulmonary artery anastomoses were demonstrated , were accomplished by injecting the bronchial artery first with no pressure on the pulmonary artery or vein , and then by injecting the pulmonary artery and vein <WSD>afterwards</WSD> . 
Meaning of the word marked with <WSD> tags:  happening at a time subsequent to a reference time