function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Ahmad, Wasim & Park, Byeong-Yong & Lee, Jae-Kook & Choi, Dong-Ro', 1],
    ['Gomes do Nascimento, Géssica Maria', 2],
    ['Ma, Wen-Zhang & Shevock, James R. & He, Si & Liu, Yan', 1],
    ['Maier, Eva & Price, Michelle J.', 2],
    ['Maroulis, Leonidas & Vardinoyannis, Katerina & Karakasi, Danae', 2],
    ['Mukhtarova, Lucia S. & Lantsova, Natalia V.', 1],
    ['Pantović, Jovana & Veljić, Milan & Grdović, Svetlana', 2],
    ['Price, Michelle J.', 7],
    ['Schileyko, Anatolyi A. & Balashov, Igor', 1],
    ['Thominot, A.', 2]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=21)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 10, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);