Criss-cross heart (CCH), first described by Lev and Rowlatt in 1961, ... and to assess the flow patterns in the pulmonary veins, umbilical artery, umbilical vein and ductus venosus.

There’s something truly magical about a perfectly baked peanut butter cookie. That rich, nutty flavor, the satisfying chewiness, and that iconic criss-cross pattern that just screams “homemade comfort ...