Michael J Palmer

Efficacy, toxicity, and quality of life in older women with early-stage breast cancer treated with letrozole or placebo after 5 years of tamoxifen: NCIC CTG intergroup trial MA.17.

Dongsheng Tu, Martine J Piccart, James N Ingle, 2008, Journal of clinical oncology : official journal of the American Society of Clinical Oncology.

Design, implementation and reporting strategies to reduce the instance and impact of missing patient-reported outcome (PRO) data: a systematic review

Melanie Calvert, M. Stockler, M. King, 2016, BMJ Open.

Randomized trial of letrozole following tamoxifen as extended adjuvant therapy in receptor-positive breast cancer: updated findings from NCIC CTG MA.17.

Robert B Livingston, Dongsheng Tu, Jeffrey S Abrams, 2005, Journal of the National Cancer Institute.