Willem Vrolik, a Dutch anatomist and paleontologist who is a pioneer in the field of vertebrate teratology, published teratological works on cyclopia, the pathogenesis of congenital anomalies, and a treatise on conjoined twins as well as Handboek der ziektekundige ontleedkunde (Handbook of pathological anatomy); however, these were later on stopped in production.
Willem Vrolik, a Dutch anatomist and paleontologist who is a pioneer in the field of vertebrate teratology, published teratological works on cyclopia, the pathogenesis of congenital anomalies, and a treatise on conjoined twins as well as Handboek der ziektekundige ontleedkunde (Handbook of pathological anatomy); however, these were later on stopped in production.