{Reference Type}: Letter {Title}: Phakomatosis pigmentovascularis IIb (phakomatosis cesioflammea) associated with the absence of infrarenal inferior vena cava. {Author}: Pan Y;Jiang X; {Journal}: Int J Dermatol {Volume}: 60 {Issue}: 5 {Year}: May 2021 {Factor}: 3.204 {DOI}: 10.1111/ijd.15334 {Abstract}: