Comment on

• Updated clinical classification of pulmonary hypertension.

  Simonneau G, Gatzoulis MA, Adatia I, Celermajer D, Denton C, Ghofrani A, Gomez Sanchez MA, Krishna Kumar R, Landzberg M, Machado RF, Olschewski H, Robbins IM, Souza R. Simonneau G, et al. J Am Coll Cardiol. 2013 Dec 24;62(25 Suppl):D34-41. doi: 10.1016/j.jacc.2013.10.029. J Am Coll Cardiol. 2013. PMID: 24355639 Review.
• Pulmonary hypertension of sickle cell disease beyond classification constraints.

  Klings ES, Morris CR, Hsu LL, Castro O, Gladwin MT, Mubarak KK. Klings ES, et al. J Am Coll Cardiol. 2014 Jul 1;63(25 Pt A):2881-2. doi: 10.1016/j.jacc.2014.01.081. Epub 2014 Apr 30. J Am Coll Cardiol. 2014. PMID: 24794120 No abstract available.