function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Chamutiová, Tímea & Hamerlík, Ladislav & Bitušík, Peter', 1],
    ['Dantas, Galileu P. S. & Siri, Augusto & Hamada, Neusa', 3],
    ['Ivkovic, Marija & Doric, Valentina & Baranov, Viktor', 1],
    ['Michailova, Paraskeva & Kownacki, Andrzej & Woźnicka, Olga', 6],
    ['Namayandeh, Armin & Bilyj, Bohdan & Beresford, David V.', 1],
    ['Silva, Fabio Laurindo Da & Pinho, Luiz Carlos', 2],
    ['Tang, Hongqu & Niitsuma, Hiromi', 4],
    ['Tasdemir, Ayse & Akyildiz, Gurcay Kivanc', 3]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=21)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 8, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);