These guidelines were authored in 2018 by a collaboration of people working professionally for transgender health in Aotearoa New Zealand. They are also hosted on the University of Waikato website: https://researchcommons.waikato.ac.nz/handle/10289/12160
You can also read the New Zealand Medical Journal publication that was based on these guidelines here: https://www.nzma.org.nz/journal-articles/guidelines-for-gender-affirming-healthcare-for-gender-diverse-and-transgender-children-young-people-and-adults-in-aotearoa-new-zealand
Published by the World Professional Association for Transgender Health.
These protocols were published by the Equinox Gender Diverse Health Centre and endorsed by ANZPATH and now AusPATH.