English to Italian Medical Medical (general) clinical trial

Sto traducendo un documento su uno studio clinico e l'autore parla di "phase II feeding study (N=122)" e questa dicitura nel paper originale viene spiegata nella frase che inserisco tra asterischi

Si tratta di uno studio in due parti: a phase 2 dose-finding portion to evaluate the dose-response relationship and select SC golimumab induction regimens for continued development, and a phase 3 dose-confirming portion to evaluate the safety and efficacy of the selected SC golimumab induction regimens.
In phase 2, 169 patients were randomized (1:1:1:1) to receive SC injections of placebo or 1 of 3 golimumab induction regimens at weeks 0 and 2 (Figure 1A). Golimumab doses were 100/50 mg, 200/100 mg, or 400/200 mg, respectively. **An additional 122 patients were enrolled while phase 2 data were being analyzed (Figure 1B); treatment regimens for this group were the same as those for phase 2**. Data for this additional group are included in the overall safety and pharmacokinetic (PK) analyses; results of efficacy analyses are reported in Supplementary Figure S1.

Avete idea di come potrei rendere quel "feeding study"? Ho pensato a "studio aggiuntivo/di supporto/extra" o concetti simili, perché non riesco a trovare una soluzione calzante/corretta.
Grazie.