Severe osteoporosis: Principles for pharmacological therapy in Mexico Patricia Clark; Fernando Carlos Rivera; Lucía Méndez Sánchez; Carlos Fernando Mendoza Gutiérrez; Jessica Liliana Vargas Neri; Sandra Miriam Carrillo Vázquez; Daniel Xavier Xibillé Friedmann; Ariana Alvarado Ceballos; José Manuel Aguilera Zepeda; Víctor Mercado Cárdenas; Hilario Ávila Amengol;

Reumataxi: An experience of solidarity in times of COVID-19 Josep Blanch-Rubió; Jone Llorente-Onaindia; Pere Benito; Jordi Monfort;