Dear colleagues,

You are invited to participate in a survey on the treatment of chronic intervillositis of unknown etiology (CIUE) cases (or chronic histiocytic intervillositis, CHI). There is currently no expert consensus in the literature on the treatment of CIUE/CHI. The aim of this survey is to synthesize current practice, in order to provide a comprehensive overview of the different treatment modalities used for CIUE/CHI.

Filling in this questionnaire will take approximately 15 minutes and can be done via:

https://data.castoredc.com/open-survey/31289695-E66C-4C8D-8BFC-1FFB12AB235F/6B50A2AC-7F2B-4466-B3D7-EEE4E7915D76/C519ED51-C03E-41B6-BC48-26FC8C83F0D0

Please share this survey with colleagues with expertise in CIUE/CHI.

Hope to hear from you. Thank you very much for your time.

Kindest regards,

Manon Bos MD/PhD MSc, post-doctoral researcher, Leiden University Medical Center, The Netherlands

Emily Cornish MD, PhD student, University College London Hospital, United Kingdom

David Williams MD/PhD, professor of obstetric medicine, University College London Hospital, United Kingdom

Marie-Louise van der Hoorn MD/PhD MSc, gynaecologist Leiden University Medical Center, The Netherlands