Wong 2012.

Methods	Type of study: parallel, 2‐arm randomised controlled trial Country of study: Hong Kong Study setting: not reported Number of participants randomised: Treatment arm 1: 112 Treatment arm 2: 111 Number of participants analysed: Treatment arm 1: 102 Treatment arm 2: 101 Follow‐up time points: next scheduled donation visit (men: 3 months; women: 4 months) Source of funding: not reported
Participants	Repeat blood donors Mean age (years): not reported Sex (male/female): 50%/50%
Interventions	Treatment arm 1: 300 mg iron fumarate (Fortifer) equivalent to 100 mg of elemental iron, once daily for 2 weeks Treatment arm 2: no iron supplementation
Outcomes	Low Hb deferral; serum ferritin levels; adverse effects; compliance
Notes	Insufficient information was included in this conference abstract for inclusion in the review. No further publications of this study have been identified

Fe2+ = ferrous compound

Hb = haemoglobin
 MCH = mean cell Hb
 MCV = mean cell volume
 MCHC = MCH concentration
 RBC = red blood cell
 RLS = restless legs syndrome