Merja Kärkkäinen

Polycontextuality and boundary crossing in expert cognition: Learning and problem solving in complex work activities

Yrjö Engeström, Ritva Engeström, Merja Kärkkäinen · Learning and Instruction · 1995 · 842 citations

Management, Knowledge Management, Organizational Behavior +15

Vitamin D status affects serum parathyroid hormone concentrations during winter in female adolescents: associations with forearm bone mineral density

Terhi A. Outila, Merja Kärkkäinen, Christel Lamberg‐Allardt · American Journal of Clinical Nutrition · 2001 · 336 citations

Medicine, Endocrinology, Nutritional Sciences +16

Association of low 25-hydroxyvitamin D concentrations with elevated parathyroid hormone concentrations and low cortical bone density in early pubertal and prepubertal Finnish girls

Sulin Cheng, Frances A. Tylavsky, Heikki Kröger et al. · American Journal of Clinical Nutrition · 2003 · 257 citations · Full text

Medicine, Endocrinology, Pediatrics +17

Vitamin D Deficiency and Bone Health in Healthy Adults in Finland: Could This Be a Concern in Other Parts of Europe?

Christel Lamberg‐Allardt, Terhi A. Outila, Merja Kärkkäinen et al. · Journal of Bone and Mineral Research · 2001 · 249 citations

Medicine, Endocrinology, Nutritional Sciences +17

A Positive Dose–Response Effect of Vitamin D Supplementation on Site-Specific Bone Mineral Augmentation in Adolescent Girls: A Double-Blinded Randomized Placebo-Controlled 1-Year Intervention

Heli Viljakainen, Anna-Mari Natri, Merja Kärkkäinen et al. · Journal of Bone and Mineral Research · 2006 · 229 citations · Full text

Medicine, Nutrition, Nutritional Sciences +17