Precisely, SummerPhD. We will include "both", actually "all" as you'll find the statistics on this, the progression of Diagnosed Stage One TTTS cases, are quite wide-ranging.  The contentious point I am referring to is the assertion that "The natural history of stage I TTTS is that more than three-fourths of cases remain stable or regress without invasive intervention, with perinatal survival of about 86%. Therefore, many patients with stage I TTTS may be managed expectantly." This is a highly questionable point, competing figures exist. Also these "non-progressing Stage Ones" still have a 14% rate of mortality, so I guess something other than TTTS killed One in Six of them? (Dr. Simpson IS referring to that "About Three Quarters" when she assigns a "Perinatal Survival of about 86%" to them, correct?) Again I thank you for your time on this, it is appreciated that there is a person of your academic caliber working on this page.