function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Chamutiová, Tímea & Hamerlík, Ladislav & Bitušík, Peter', 5],
    ['Epler, John H.', 1],
    ['Imada, Yume', 1],
    ['Ivkovic, Marija & Doric, Valentina & Baranov, Viktor', 4],
    ['Makarchenko, Eugenyi A. & Semenchenko, Alexander A.', 1],
    ['Namayandeh, Armin & Bilyj, Bohdan & Beresford, David V.', 3],
    ['Rossaro, Bruno', 1],
    ['Tasdemir, Ayse & Akyildiz, Gurcay Kivanc', 15]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=31)',
    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);