Update oae.md

changed urls to url

Author: zhengj2007

ontology/oae.md

@@ -34,9 +34,8 @@ usages:
   - description: OAE was used to analyze and differentiate adverse events associated with inactivated and live attenuated influenza vaccines reported in VAERS
     url: https://pubmed.ncbi.nlm.nih.gov/23209624/
   - description: OAE was used to analyze COVID-19 vaccine adverse events reported in VAERS
-    urls:
-    - https://pubmed.ncbi.nlm.nih.gov/35814246/
-    - https://pubmed.ncbi.nlm.nih.gov/41971073/
+    url: https://pubmed.ncbi.nlm.nih.gov/35814246/
+    url: https://pubmed.ncbi.nlm.nih.gov/41971073/
   - description: OAE was used to analyze adverse events associated with monovalent and combination vaccines against Hepatitis A and B diseases reported in VAERS
     url: https://pubmed.ncbi.nlm.nih.gov/27694888/
   user: biomedical researchers
@@ -54,8 +53,7 @@ usages:
   examples:
   - description: The VIOLIN vaccine safety database (Vaxafe) uses OAE to map adverse event information in vaccine adverse event case reports, for example, Vaxafe uses OAE to represent many adverse events (such as Convulsion, Cough) reported in a VAERS case ID - 204308.
     url: https://violinet.org/vaxafe/case.php?vaers_id=204308
-  user: https://violinet.org/
-  
+  user: https://violinet.org/  
 ---
 
 The Ontology of Adverse Events (OAE) is a biomedical ontology in the domain of adverse events. OAE aims to standardize adverse event annotation, integrate various adverse event data, and support computer-assisted reasoning.  OAE is a community-based ontology. Its development follows the OBO Foundry principles.