author contributions template

but have not set roles in the metadata

content/02.body.md

@@ -440,3 +440,24 @@ This work was supported, in part, by Pfizer Worldwide Research, Development, and
 The funders had no role in the study design, data analysis and interpretation, or writing of the manuscript.
 
 ### Authors' contributions
+
+Author contributions are noted here according to [CRediT](https://credit.niso.org/) (Contributor Roles Taxonomy).
+{%- set roles = {} -%}
+{%- for author in manubot.authors -%}
+  {% for role in author.get('roles', []) -%}
+    {%- if role in roles -%}
+      {% set _ = roles[role].append(author.initials) %}
+    {%- else -%}
+      {% set _ = roles.update({role: [author.initials]}) %}
+    {%- endif -%}
+  {%- endfor -%}
+{%- endfor %}
+{% for role, author_initials in roles.items() -%}
+{% if author_initials|length > 2 %}
+  {{- role }} by {{ ', '.join(author_initials[:-1]) }}, and {{ author_initials[-1] }}.
+{% elif author_initials|length == 2 %}
+  {{- role }} by {{ ' and '.join(author_initials) }}.
+{% else %}
+  {{- role }} by {{ author_initials[0] }}.
+{%- endif -%}
+{%- endfor %}