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We present the first results of K2-OjOS, a collaborative project between professional and amateur astronomers primarily aimed to detect, characterize and validate new extrasolar planets. For this work, 10 amateur astronomers looked for planetary signals by visually inspecting the 20,427 light curves of K2 campaign 18 (C18). They found 42 planet candidates, of which 18 are new detections and 24 had been detected in the overlapping C5 by previous works. We used archival photometric and spectroscopic observations, as well as new high-spatial resolution images in order to carry out a complete analysis of the candidates found, including a homogeneous characterization of the host stars, transit modeling, search for transit timing variations and statistical validation. As a result, we report four new planets (K2-355 b, K2-356 b, K2-357 b, and K2-358 b) and 14 planet candidates. Besides, we refine the transit ephemeris of the previously published planets and candidates by modeling C5, C16 (when available) and C18 photometric data jointly, largely improving the period and mid-transit time precision. Regarding individual systems, we highlight the new planet K2-356 b and candidate EPIC 211537087.02 being near a 2:1 period commensurability, the detection of significant TTVs in the bright star K2-184 (V = 10.35), the location of K2-103 b inside the habitable zone according to optimistic models, the detection of a new single transit in the known system K2-274, and the disposition reassignment of K2-120 b, which we consider as a planet candidate as the origin of the signal can not be ascertained.

Background Induction of labour (IDP) is the artificial initiation of labour with the goal of achieving a vaginal delivery. IDP is one of the most frequently performed obstetric procedures in the world. Recent data indicate a highly variable percentage of induction depending on the country. Methods A descriptive study was carried out on different aspects that are part of the ITP process through a survey prepared according to the Delphi method distributed among the 37 participating hospitals from June to October 2021. Results The mean induction rate was 30.6%. The average rate of caesarean sections was 21.4%. 75% of the centers had a rate higher than 20% and only in 1 center was it lower than 15%. In 11 centers they were not available to use misoprostol and in 4 centers they did not have oxytocin as PDI. Mechanical methods were available in 23 hospitals. In 16 centers they had a double Cook balloon; in 5 they used a Foley catheter and in 2 hospitals they used both devices. In 4 hospitals they used mechanical methods simultaneously with prostaglandins. In all but 5 centers, continuous monitoring was performed in low-risk pregnancies, at least for the first hour. In these 5 centers, windows of 20 minutes were carried out from the start of the induction.