TY - JOUR AU - Fietze, I; Strauch, J; Holzhausen, M TI - Sleep quality in professional ballet dancers JO - Chronobiol Int VL - 26 PY - 2009 DO - 10.3109/07420520903221319 L3 - PubMed-ID: 19731116 SP - 1249 EP - 1262 N1 - et al. ER -