Kamphuis, DRosielle, Kvan Welie, NRoest, Ivan Dongen, A J C MBrinkhuis, E ABourdrez, PMozes, AVerhoeve, H Rvan der Ham, D PVrouenraets, F P J MRisseeuw, J Jvan de Laar, TJanse, Fden Hartog, J Ede Hundt, MHooker, A BHuppelschoten, A GPieterse, Q DBongers, M YStoker, JKoks, C A MLambalk, C BHemingway, ALi, WMol, B W JDreyer, KMijatovic, V2023-06-192023-06-192023-05-06Kamphuis, D, Rosielle, K, van Welie, N, Roest, I, van Dongen, A J C M, Brinkhuis, E A, Bourdrez, P, Mozes, A, Verhoeve, H R, van der Ham, D P, Vrouenraets, F P J M, Risseeuw, J J, van de Laar, T, Janse, F, den Hartog, J E, de Hundt, M, Hooker, A B, Huppelschoten, A G, Pieterse, Q D, Bongers, M Y, Stoker, J, Koks, C A M, Lambalk, C B, Hemingway, A, Li, W, Mol, B W J, Dreyer, K & Mijatovic, V 2023, 'The effectiveness of immediate versus delayed tubal flushing with oil-based contrast in women with unexplained infertility (H2Oil-timing study) : study protocol of a randomized controlled trial', BMC Women's Health, vol. 23, no. 1, 233. https://doi.org/10.1186/s12905-023-02385-1, https://doi.org/10.1186/s12905-023-02574-y1472-6874PubMedCentral: PMC10164300https://hdl.handle.net/2164/20919Funding Information: DK, NvW, IR, AJCMvD, EAB, PB, AM, HRV, DPvdH, FPJMV, JJR, TvdL, JEdH, MdH, AGH, QDP, MYB, and CAMK have nothing to declare. KR and FJ reports receiving a travel grant from Merck. ABH reports receiving a travel –and speaker’s fee from Merck and speakers fee from Nordic Pharma. JS has a research agreement with Takeda not related to this topic. CBL reports receiving research grants from Merck, Ferring and Guerbet. AH reports receiving travel and speaker’s fees from Guerbet and reports past consultancy for Guerbet. WL reports receiving research grants from the NHMRC Centre for Research Excellence in Women’s Health in Reproductive Life and Norman Beischer Medical Research Foundation not related to this study. BWM is supported by a NHMRC investigator grant (GNT1176437) and reports consultancy for ObsEva and Merck and travel support from Merck. KD reports receiving travel and speaker’s fees from Guerbet and research grants from Guerbet. VM reports receiving travel -and speaker’s fees from Guerbet as well as research grants from Guerbet, Merck and Ferring. Funding Information: This study is an investigator-initiated study funded by ZonMw, the Dutch organization for Health Research and Development (project number 852001932) and an additional funding of Guerbet, France. The study is designed without contribution of the funders. The funders will have no role in collection, analyses, and interpretation of the data, nor in writing the manuscript. Publisher Copyright: © 2023, The Author(s). Correction: The effectiveness of immediate versus delayed tubal flushing with oil-based contrast in women with unexplained infertility (H2Oil-timing study): study protocol of a randomized controlled trial BMC Women's Health volume 23, Article number: 424 (2023) Correction: BMC Women’s Health 23, 233 (2023) https://doi.org/10.1186/s12905-023-02385-1753491engFemaleHumansPregnancyContrast Media/therapeutic useFallopian Tubes/diagnostic imagingHysterosalpingography/adverse effectsInfertility, Female/etiologyMulticenter Studies as TopicPregnancy RateRandomized Controlled Trials as TopicRandomized controlled trialTubal flushingInfertilityFallopian tubesHysterosalpingography (HSG)Live birthOil-based contrast mediumFertility work-upCost-effectivenessRG Gynecology and obstetricsObstetrics and GynaecologyReproductive MedicineSupplementary InformationRGJournal article10.1186/s12905-023-02385-1http://www.scopus.com/inward/record.url?scp=85158032222&partnerID=8YFLogxK231