[Laparoscopic excision versus open excision for the treatment of choledochal cysts: a systematic review and meta-analysis].

Objective: To determine if laparoscopic excision is more effective than open excision in the treatment of choledochal cysts.

Material And Methods: A systematic review of randomized clinical trials in 3 databases measuring the efficacy of laparoscopic and open excision of choledochal cysts was performed. The authors considered international and national reports, whose results were analyzed in detail.

A modified SEIR model to predict the behavior of the early stage in coronavirus and coronavirus-like outbreaks.

COVID-19 is a highly infectious disease that emerged in China at the end of 2019. The COVID-19 pandemic is the first known pandemic caused by a coronavirus, namely, the new and emerging SARS-CoV-2 coronavirus. In the present work, we present simulations of the initial outbreak of this new coronavirus using a modified transmission rate SEIR model that takes into account the impact of government actions and the perception of risk by individuals in reaction to the proportion of fatal cases.

[Reproduction of the fish Brotula clarkae (Pisces: Ophidiidae) in the Colombian Pacific].

We studied the reproductive ecology of the fish Brotula clarkae based on 754 individuals obtained from the industrial and artisanal fisheries in the Colombian Pacific (March 1994 to December 1996). Histological sections (paraplast embedding and Harris's hematoxylin-eosin stain) were made from 151 females (26-100 cm total length). Additionally, mean diameter and particular features are described for oocyte phases and ovarian development stages.