function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Gankhuyag, Enkhtsetseg & Dorjsuren, Altanchimeg & Choi, Eun Hwa', 2],
    ['Kim, Tae-Woo & Puskás, Gellért', 2],
    ['Koschuh, A.', 1],
    ['MACHÁýKOVÁ, Lenka & FIKÁýEK, Martin', 1],
    ['Monnerat C. & Thorens P. & Walter T. & Gonseth Y.', 2],
    ['Sergeev, M. G. & Storozhenko, S. Yu. & Benediktov, A. A.', 1],
    ['Storozhenko, Sergey Yu.', 2]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=11)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 7, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);