started related work section

thesis/sections/background.tex

@@ -92,6 +92,8 @@ The irregular example highlights how multiple parameters can vary between indivi
 cycle length, timing of ovulation, temperature shift magnitude between phases, and intra-phase temperature variability.
 This multidimensional variability underscores the need for adaptive, data-driven models capable of learning personalized patterns---
 rather than relying on population-wide assumptions.
+For a regular cycle pattern, sophisticated analysis or predictions are often not necessary, as the last ovulation day
+can reliably be used as the next.
 
 \begin{figure}[htbp]
     \centering
@@ -107,8 +109,6 @@ rather than relying on population-wide assumptions.
     \label{fig:background_regular_cycles}
 \end{figure}
 
-%TODO: show plot of different cycle types
-
 \subsubsection{Fertility Prediction}\label{subsubsec:fertility_prediction}
 Throughout the menstrual cycle, the chance of fertilization varies significantly.
 An egg cell released from the ovary during ovulation, can be fertilized for up to 24 hours.