Dear Dave,
Thank you for posting this CFP. From the description here or the link, I couldn't figure out if this is a two-step process wherein authors must submit full papers only after abstracts have been reviewed and accepted. If you happen to know, kindly let us know.

Kind regards
paresh

The WHO/UNICEF JMP, UN-Habitat and npj Clean Water are collaborating on a new collection of papers that will broadly explore efforts to monitor the full sanitation chain from containment, transport, treatment and final disposal or reuse. The submission deadline for interested authors is 1 February 2024. Studies examining inequalities in exposure to the impacts of inadequate sanitation and wastewater treatment, focused on vulnerable populations such as those living in refugee or IDP settings, and the specific sanitation and wastewater services needs of women and girls and persons living with disabilities are strongly encouraged. Submissions are equally encouraged from low-, middle- and high-income countries.

Learn more here: www.nature.com/collections/bjiihhaejc